diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 63eb8893..15499106 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -43,6 +43,8 @@ applications/gui/** @skotopes
 # iButton
 
 applications/ibutton/** @DrZlo13
+lib/cyfral/** @DrZlo13
+lib/onewire/** @DrZlo13
 
 # IR
 
@@ -61,9 +63,12 @@ applications/menu/** @skotopes
 applications/nfc/** @skotopes
 lib/ST25RFAL002/** @skotopes
 
-# SD Card
+# SD Card and filesystem
 
 applications/sd-card-test/** @DrZlo13
+applications/sd-filesystem/** @DrZlo13
+lib/common-api/filesystem-api.h @DrZlo13
+lib/fatfs/** @DrZlo13
 
 # Power control app
 
@@ -74,3 +79,7 @@ applications/power/** @skotopes
 applications/music-player/** @DrZlo13
 applications/floopper-bloopper/** @glitchcore
 applications/gpio-tester/** @glitchcore
+
+lib/app-template/** @DrZlo13
+lib/qrcode/** @DrZlo13
+lib/callback-connector/** @DrZlo13
\ No newline at end of file
diff --git a/applications/applications.h b/applications/applications.h
index 8395d52b..1b80891f 100644
--- a/applications/applications.h
+++ b/applications/applications.h
@@ -41,6 +41,7 @@ void cli_task(void* p);
 void music_player(void* p);
 void sdnfc(void* p);
 void floopper_bloopper(void* p);
+void sd_filesystem(void* p);
 
 const FlipperStartupApp FLIPPER_STARTUP[] = {
 #ifdef APP_DISPLAY
@@ -88,6 +89,13 @@ const FlipperStartupApp FLIPPER_STARTUP[] = {
      .icon = A_Plugins_14},
 #endif
 
+#ifdef APP_SD_FILESYSTEM
+    {.app = sd_filesystem,
+     .name = "sd_filesystem",
+     .libs = {1, FURI_LIB{"menu_task"}},
+     .icon = A_Plugins_14},
+#endif
+
 #ifdef APP_DOLPHIN
     {.app = dolphin_task,
      .name = "dolphin_task",
@@ -165,7 +173,7 @@ const FlipperStartupApp FLIPPER_STARTUP[] = {
 #ifdef APP_SD_TEST
     {.app = sd_card_test,
      .name = "sd_card_test",
-     .libs = {1, FURI_LIB{"gui_task"}},
+     .libs = {2, FURI_LIB{"gui_task", "sd_filesystem"}},
      .icon = A_Plugins_14},
 #endif
 
@@ -257,7 +265,7 @@ const FlipperStartupApp FLIPPER_PLUGINS[] = {
 #ifdef BUILD_SD_TEST
     {.app = sd_card_test,
      .name = "sd_card_test",
-     .libs = {1, FURI_LIB{"gui_task"}},
+     .libs = {2, FURI_LIB{"gui_task", "sd_filesystem"}},
      .icon = A_Plugins_14},
 #endif
 
diff --git a/applications/applications.mk b/applications/applications.mk
index 470c5da0..e27f6146 100644
--- a/applications/applications.mk
+++ b/applications/applications.mk
@@ -13,6 +13,7 @@ APP_NFC  = 1
 APP_POWER = 1
 APP_BT = 1
 APP_CLI = 1
+APP_SD_FILESYSTEM = 1
 BUILD_IRDA  = 1
 APP_DOLPHIN = 1
 BUILD_EXAMPLE_BLINK = 1
@@ -220,6 +221,7 @@ CFLAGS		+= -DBUILD_SD_TEST
 CPP_SOURCES	+= $(wildcard $(APP_DIR)/sd-card-test/*.cpp)
 APP_INPUT = 1
 APP_GUI = 1
+APP_SD_FILESYSTEM = 1
 endif
 
 APP_SPEAKER_DEMO ?= 0
@@ -305,6 +307,12 @@ C_SOURCES	+= $(wildcard $(APP_DIR)/gui/*.c)
 C_SOURCES	+= $(wildcard $(APP_DIR)/backlight-control/*.c)
 endif
 
+APP_SD_FILESYSTEM	?= 0
+ifeq ($(APP_SD_FILESYSTEM), 1)
+CFLAGS		+= -DAPP_SD_FILESYSTEM
+C_SOURCES	+= $(wildcard $(APP_DIR)/sd-filesystem/*.c)
+endif
+
 # deprecated
 ifeq ($(APP_DISPLAY), 1)
 CFLAGS		+= -DAPP_DISPLAY
diff --git a/applications/sd-card-test/sd-card-test.cpp b/applications/sd-card-test/sd-card-test.cpp
index c2361511..dfe135f7 100644
--- a/applications/sd-card-test/sd-card-test.cpp
+++ b/applications/sd-card-test/sd-card-test.cpp
@@ -1,7 +1,7 @@
 #include "app-template.h"
-#include "fatfs/ff.h"
 #include "stm32_adafruit_sd.h"
 #include "fnv1a-hash.h"
+#include "filesystem-api.h"
 
 // event enumeration type
 typedef uint8_t event_t;
@@ -43,17 +43,15 @@ public:
     // vars
     GpioPin* red_led_record;
     GpioPin* green_led_record;
-    FATFS sd_fat_fs;
-    char sd_path[6];
     const uint32_t benchmark_data_size = 4096;
     uint8_t* benchmark_data;
+    FS_Api* fs_api;
 
     // funcs
     void run();
     void render(Canvas* canvas);
     template <class T> void set_text(std::initializer_list<T> list);
     template <class T> void set_error(std::initializer_list<T> list);
-    const char* fatfs_error_desc(FRESULT res);
     void wait_for_button(Input input_button);
     bool ask(Input input_button_cancel, Input input_button_ok);
     void blink_red();
@@ -63,11 +61,6 @@ public:
     // "tests"
     void detect_sd_card();
     void show_warning();
-    void init_sd_card();
-    bool is_sd_card_formatted();
-    void ask_and_format_sd_card();
-    void mount_sd_card();
-    void format_sd_card();
     void get_sd_card_info();
 
     void prepare_benchmark_data();
@@ -76,7 +69,7 @@ public:
     uint32_t write_benchmark_internal(const uint32_t size, const uint32_t tcount);
 
     void read_benchmark();
-    uint32_t read_benchmark_internal(const uint32_t size, const uint32_t count, FIL* file);
+    uint32_t read_benchmark_internal(const uint32_t size, const uint32_t count, File* file);
 
     void hash_benchmark();
 };
@@ -97,16 +90,17 @@ void SdTest::run() {
 
     app_ready();
 
-    detect_sd_card();
-    show_warning();
-    init_sd_card();
-    if(!is_sd_card_formatted()) {
-        format_sd_card();
-    } else {
-        ask_and_format_sd_card();
+    fs_api = static_cast<FS_Api*>(furi_open("sdcard"));
+
+    if(fs_api == NULL) {
+        set_error({"cannot get sdcard api"});
+        exit();
     }
-    mount_sd_card();
+
+    detect_sd_card();
     get_sd_card_info();
+    show_warning();
+
     prepare_benchmark_data();
     write_benchmark();
     read_benchmark();
@@ -134,7 +128,7 @@ void SdTest::detect_sd_card() {
     uint8_t i = 0;
 
     // detect sd card pin
-    while(!hal_gpio_read_sd_detect()) {
+    while(fs_api->common.get_fs_info(NULL, NULL) == FSE_NOT_READY) {
         delay(100);
 
         snprintf(str_buffer, str_buffer_size, "Waiting%s", dots[i]);
@@ -155,7 +149,7 @@ void SdTest::show_warning() {
     set_text(
         {"!!Warning!!",
          "during the tests",
-         "card may be formatted",
+         "files can be overwritten",
          "or data on card may be lost",
          "",
          "press UP DOWN OK to continue"});
@@ -165,96 +159,22 @@ void SdTest::show_warning() {
     wait_for_button(InputOk);
 }
 
-// init low level driver
-void SdTest::init_sd_card() {
-    uint8_t bsp_result = BSP_SD_Init();
-
-    // BSP_SD_OK = 0
-    if(bsp_result) {
-        set_error({"SD card init error", "BSP error"});
-    }
-    blink_green();
-}
-
-// test, if sd card need to be formatted
-bool SdTest::is_sd_card_formatted() {
-    FRESULT result;
-    set_text({"checking if card needs to be formatted"});
-
-    result = f_mount(&sd_fat_fs, sd_path, 1);
-    if(result == FR_NO_FILESYSTEM) {
-        return false;
-    } else {
-        return true;
-    }
-}
-
-void SdTest::ask_and_format_sd_card() {
-    set_text({"Want to format sd card?", "", "", "", "", "LEFT to CANCEL | RIGHT to OK"});
-    if(ask(InputLeft, InputRight)) {
-        format_sd_card();
-    }
-}
-
-// mount sd card
-void SdTest::mount_sd_card() {
-    FRESULT result;
-    set_text({"mounting sdcard"});
-
-    result = f_mount(&sd_fat_fs, sd_path, 1);
-    if(result) {
-        set_error({"SD card mount error", fatfs_error_desc(result)});
-    }
-    blink_green();
-}
-
-// format sd card
-void SdTest::format_sd_card() {
-    FRESULT result;
-    BYTE* work_area;
-
-    set_text({"formatting sdcard", "procedure can be lengthy", "please wait"});
-    delay(100);
-
-    work_area = static_cast<BYTE*>(malloc(_MAX_SS));
-    if(work_area == NULL) {
-        set_error({"SD card format error", "cannot allocate memory"});
-    }
-
-    result = f_mkfs(sd_path, (FM_FAT | FM_FAT32 | FM_EXFAT), 0, work_area, _MAX_SS);
-    free(work_area);
-
-    if(result) {
-        set_error({"SD card format error", fatfs_error_desc(result)});
-    }
-
-    result = f_setlabel("Flipper SD");
-    if(result) {
-        set_error({"SD card set label error", fatfs_error_desc(result)});
-    }
-    blink_green();
-}
-
 // get info about sd card, label, sn
 // sector, cluster, total and free size
 void SdTest::get_sd_card_info() {
     const uint8_t str_buffer_size = 26;
-    char str_buffer[4][str_buffer_size];
-    char volume_label[128];
-    DWORD serial_num;
-    FRESULT result;
-    FATFS* fs;
-    DWORD free_clusters, free_sectors, total_sectors;
-
-    // suppress "'%s' directive output may be truncated" warning about snprintf
+    char str_buffer[2][str_buffer_size];
+    FS_Error result;
+    uint64_t bytes_total, bytes_free;
     int __attribute__((unused)) snprintf_count = 0;
 
-    // get label and s/n
-    result = f_getlabel(sd_path, volume_label, &serial_num);
-    if(result) set_error({"f_getlabel error", fatfs_error_desc(result)});
+    result = fs_api->common.get_fs_info(&bytes_total, &bytes_free);
+    if(result != FSE_OK) set_error({"get_fs_info error", fs_api->error.get_desc(result)});
 
-    snprintf_count = snprintf(str_buffer[0], str_buffer_size, "Label: %s", volume_label);
-    snprintf(str_buffer[1], str_buffer_size, "S/N: %lu", serial_num);
+    snprintf(
+        str_buffer[0], str_buffer_size, "%lu KB total", static_cast<uint32_t>(bytes_total / 1024));
+    snprintf(
+        str_buffer[1], str_buffer_size, "%lu KB free", static_cast<uint32_t>(bytes_free / 1024));
 
     set_text(
         {static_cast<const char*>(str_buffer[0]),
@@ -267,30 +187,6 @@ void SdTest::get_sd_card_info() {
     blink_green();
 
     wait_for_button(InputOk);
-
-    // get total and free space
-    result = f_getfree(sd_path, &free_clusters, &fs);
-    if(result) set_error({"f_getfree error", fatfs_error_desc(result)});
-
-    total_sectors = (fs->n_fatent - 2) * fs->csize;
-    free_sectors = free_clusters * fs->csize;
-
-    snprintf(str_buffer[0], str_buffer_size, "Cluster: %d sectors", fs->csize);
-    snprintf(str_buffer[1], str_buffer_size, "Sector: %d bytes", fs->ssize);
-    snprintf(str_buffer[2], str_buffer_size, "%lu KB total", total_sectors / 1024 * fs->ssize);
-    snprintf(str_buffer[3], str_buffer_size, "%lu KB free", free_sectors / 1024 * fs->ssize);
-
-    set_text(
-        {static_cast<const char*>(str_buffer[0]),
-         static_cast<const char*>(str_buffer[1]),
-         static_cast<const char*>(str_buffer[2]),
-         static_cast<const char*>(str_buffer[3]),
-         "",
-         "press OK to continue"});
-
-    blink_green();
-
-    wait_for_button(InputOk);
 }
 
 // prepare benchmark data (allocate data in ram)
@@ -375,30 +271,27 @@ void SdTest::write_benchmark() {
 
 uint32_t SdTest::write_benchmark_internal(const uint32_t size, const uint32_t count) {
     uint32_t start_tick, stop_tick, benchmark_bps, benchmark_time, bytes_written;
-    FRESULT result;
-    FIL file;
+    File file;
 
     const uint8_t str_buffer_size = 32;
     char str_buffer[str_buffer_size];
 
-    result = f_open(&file, "write.test", FA_WRITE | FA_OPEN_ALWAYS);
-    if(result) {
+    if(!fs_api->file.open(&file, "write.test", FSAM_WRITE, FSOM_OPEN_ALWAYS)) {
         snprintf(str_buffer, str_buffer_size, "in %lu-byte write test", size);
         set_error({"cannot open file ", static_cast<const char*>(str_buffer)});
     }
 
     start_tick = osKernelGetTickCount();
     for(size_t i = 0; i < count; i++) {
-        result = f_write(&file, benchmark_data, size, reinterpret_cast<UINT*>(&bytes_written));
-        if(bytes_written != size || result) {
+        bytes_written = fs_api->file.write(&file, benchmark_data, size);
+        if(bytes_written != size || file.error_id != FSE_OK) {
             snprintf(str_buffer, str_buffer_size, "in %lu-byte write test", size);
             set_error({"cannot write to file ", static_cast<const char*>(str_buffer)});
         }
     }
     stop_tick = osKernelGetTickCount();
 
-    result = f_close(&file);
-    if(result) {
+    if(!fs_api->file.close(&file)) {
         snprintf(str_buffer, str_buffer_size, "in %lu-byte write test", size);
         set_error({"cannot close file ", static_cast<const char*>(str_buffer)});
     }
@@ -425,8 +318,7 @@ void SdTest::read_benchmark() {
         static_cast<const char*>(str_buffer[4]),
         static_cast<const char*>(str_buffer[5])};
 
-    FRESULT result;
-    FIL file;
+    File file;
 
     const uint32_t b1_size = 1;
     const uint32_t b8_size = 8;
@@ -438,21 +330,18 @@ void SdTest::read_benchmark() {
     set_text({"prepare data", "for read speed test", "procedure can be lengthy", "please wait"});
     delay(100);
 
-    result = f_open(&file, "read.test", FA_WRITE | FA_OPEN_ALWAYS);
-    if(result) {
+    if(!fs_api->file.open(&file, "read.test", FSAM_WRITE, FSOM_OPEN_ALWAYS)) {
         set_error({"cannot open file ", "in prepare read"});
     }
 
     for(size_t i = 0; i < benchmark_data_size / b4096_size; i++) {
-        result =
-            f_write(&file, benchmark_data, b4096_size, reinterpret_cast<UINT*>(&bytes_written));
-        if(bytes_written != b4096_size || result) {
+        bytes_written = fs_api->file.write(&file, benchmark_data, b4096_size);
+        if(bytes_written != b4096_size || file.error_id != FSE_OK) {
             set_error({"cannot write to file ", "in prepare read"});
         }
     }
 
-    result = f_close(&file);
-    if(result) {
+    if(!fs_api->file.close(&file)) {
         set_error({"cannot close file ", "in prepare read"});
     }
 
@@ -461,8 +350,7 @@ void SdTest::read_benchmark() {
     delay(100);
 
     // open file
-    result = f_open(&file, "read.test", FA_READ | FA_OPEN_EXISTING);
-    if(result) {
+    if(!fs_api->file.open(&file, "read.test", FSAM_READ, FSOM_OPEN_EXISTING)) {
         set_error({"cannot open file ", "in read benchmark"});
     }
 
@@ -497,8 +385,7 @@ void SdTest::read_benchmark() {
     set_text(string_list);
 
     // close file
-    result = f_close(&file);
-    if(result) {
+    if(!fs_api->file.close(&file)) {
         set_error({"cannot close file ", "in read test"});
     }
 
@@ -507,9 +394,9 @@ void SdTest::read_benchmark() {
     wait_for_button(InputOk);
 }
 
-uint32_t SdTest::read_benchmark_internal(const uint32_t size, const uint32_t count, FIL* file) {
+uint32_t SdTest::read_benchmark_internal(const uint32_t size, const uint32_t count, File* file) {
     uint32_t start_tick, stop_tick, benchmark_bps, benchmark_time, bytes_readed;
-    FRESULT result;
+    //FRESULT result;
 
     const uint8_t str_buffer_size = 32;
     char str_buffer[str_buffer_size];
@@ -522,12 +409,12 @@ uint32_t SdTest::read_benchmark_internal(const uint32_t size, const uint32_t cou
         set_error({"cannot allocate memory", static_cast<const char*>(str_buffer)});
     }
 
-    f_rewind(file);
+    fs_api->file.seek(file, 0, true);
 
     start_tick = osKernelGetTickCount();
     for(size_t i = 0; i < count; i++) {
-        result = f_read(file, read_buffer, size, reinterpret_cast<UINT*>(&bytes_readed));
-        if(bytes_readed != size || result) {
+        bytes_readed = fs_api->file.read(file, read_buffer, size);
+        if(bytes_readed != size || file->error_id != FSE_OK) {
             snprintf(str_buffer, str_buffer_size, "in %lu-byte read test", size);
             set_error({"cannot read from file ", static_cast<const char*>(str_buffer)});
         }
@@ -555,8 +442,7 @@ void SdTest::hash_benchmark() {
     const uint8_t str_buffer_size = 32;
     char str_buffer[3][str_buffer_size] = {"", "", ""};
 
-    FRESULT result;
-    FIL file;
+    File file;
 
     const uint32_t b4096_size = 4096;
     const uint32_t benchmark_count = 20;
@@ -566,17 +452,15 @@ void SdTest::hash_benchmark() {
     delay(100);
 
     // write data to test file and calculate hash
-    result = f_open(&file, "hash.test", FA_WRITE | FA_OPEN_ALWAYS);
-    if(result) {
+    if(!fs_api->file.open(&file, "hash.test", FSAM_WRITE, FSOM_OPEN_ALWAYS)) {
         set_error({"cannot open file ", "in prepare hash"});
     }
 
     for(uint32_t i = 0; i < benchmark_count; i++) {
         mcu_data_hash = fnv1a_buffer_hash(benchmark_data, b4096_size, mcu_data_hash);
-        result =
-            f_write(&file, benchmark_data, b4096_size, reinterpret_cast<UINT*>(&bytes_written));
+        bytes_written = fs_api->file.write(&file, benchmark_data, b4096_size);
 
-        if(bytes_written != b4096_size || result) {
+        if(bytes_written != b4096_size || file.error_id != FSE_OK) {
             set_error({"cannot write to file ", "in prepare hash"});
         }
 
@@ -585,8 +469,7 @@ void SdTest::hash_benchmark() {
         delay(100);
     }
 
-    result = f_close(&file);
-    if(result) {
+    if(!fs_api->file.close(&file)) {
         set_error({"cannot close file ", "in prepare hash"});
     }
 
@@ -602,16 +485,15 @@ void SdTest::hash_benchmark() {
         set_error({"cannot allocate memory", "in hash test"});
     }
 
-    result = f_open(&file, "hash.test", FA_READ | FA_OPEN_EXISTING);
-    if(result) {
+    if(!fs_api->file.open(&file, "hash.test", FSAM_READ, FSOM_OPEN_EXISTING)) {
         set_error({"cannot open file ", "in hash test"});
     }
 
     for(uint32_t i = 0; i < benchmark_count; i++) {
-        result = f_read(&file, read_buffer, b4096_size, reinterpret_cast<UINT*>(&bytes_readed));
+        bytes_readed = fs_api->file.read(&file, read_buffer, b4096_size);
         sdcard_data_hash = fnv1a_buffer_hash(read_buffer, b4096_size, sdcard_data_hash);
 
-        if(bytes_readed != b4096_size || result) {
+        if(bytes_readed != b4096_size || file.error_id != FSE_OK) {
             set_error({"cannot read from file ", "in hash test"});
         }
 
@@ -620,9 +502,7 @@ void SdTest::hash_benchmark() {
         delay(100);
     }
 
-    result = f_close(&file);
-
-    if(result) {
+    if(!fs_api->file.close(&file)) {
         set_error({"cannot close file ", "in hash test"});
     }
 
@@ -730,76 +610,6 @@ void SdTest::blink_green() {
     gpio_write(green_led_record, 1);
 }
 
-// FatFs errors descriptions
-const char* SdTest::fatfs_error_desc(FRESULT res) {
-    switch(res) {
-    case FR_OK:
-        return "ok";
-        break;
-    case FR_DISK_ERR:
-        return "low level error";
-        break;
-    case FR_INT_ERR:
-        return "internal error";
-        break;
-    case FR_NOT_READY:
-        return "not ready";
-        break;
-    case FR_NO_FILE:
-        return "no file";
-        break;
-    case FR_NO_PATH:
-        return "no path";
-        break;
-    case FR_INVALID_NAME:
-        return "invalid name";
-        break;
-    case FR_DENIED:
-        return "denied";
-        break;
-    case FR_EXIST:
-        return "already exist";
-        break;
-    case FR_INVALID_OBJECT:
-        return "invalid file/dir obj";
-        break;
-    case FR_WRITE_PROTECTED:
-        return "write protected";
-        break;
-    case FR_INVALID_DRIVE:
-        return "invalid drive";
-        break;
-    case FR_NOT_ENABLED:
-        return "no work area in volume";
-        break;
-    case FR_NO_FILESYSTEM:
-        return "no valid FS volume";
-        break;
-    case FR_MKFS_ABORTED:
-        return "aborted, any problem";
-        break;
-    case FR_TIMEOUT:
-        return "timeout";
-        break;
-    case FR_LOCKED:
-        return "file locked";
-        break;
-    case FR_NOT_ENOUGH_CORE:
-        return "not enough core memory";
-        break;
-    case FR_TOO_MANY_OPEN_FILES:
-        return "too many open files";
-        break;
-    case FR_INVALID_PARAMETER:
-        return "invalid parameter";
-        break;
-
-    default:
-        return "unknown error";
-        break;
-    }
-}
-
 // set text, but with infinite loop
 template <class T> void SdTest::set_error(std::initializer_list<T> list) {
     set_text(list);
diff --git a/applications/sd-filesystem/sd-filesystem-api.c b/applications/sd-filesystem/sd-filesystem-api.c
new file mode 100644
index 00000000..7301fd5b
--- /dev/null
+++ b/applications/sd-filesystem/sd-filesystem-api.c
@@ -0,0 +1,738 @@
+#include "fatfs.h"
+#include "filesystem-api.h"
+#include "sd-filesystem.h"
+
+/******************* Global vars for api *******************/
+
+static SdFsInfo* fs_info;
+
+/******************* Core Functions *******************/
+
+bool _fs_init(SdFsInfo* _fs_info) {
+    bool result = true;
+    _fs_info->mutex = osMutexNew(NULL);
+    if(_fs_info->mutex == NULL) result = false;
+
+    for(uint8_t i = 0; i < SD_FS_MAX_FILES; i++) {
+        _fs_info->files[i].thread_id = NULL;
+    }
+
+    _fs_info->path = "0:/";
+    _fs_info->status = SD_NO_CARD;
+
+    // store pointer for api fns
+    fs_info = _fs_info;
+
+    return result;
+}
+
+bool _fs_lock(SdFsInfo* fs_info) {
+    return (osMutexAcquire(fs_info->mutex, osWaitForever) == osOK);
+}
+
+bool _fs_unlock(SdFsInfo* fs_info) {
+    return (osMutexRelease(fs_info->mutex) == osOK);
+}
+
+SDError _get_filedata(SdFsInfo* fs_info, File* file, FileData** filedata, FiledataFilter filter) {
+    SDError error = SD_OK;
+    _fs_lock(fs_info);
+
+    if(fs_info->status == SD_OK) {
+        if(file != NULL && file->file_id < SD_FS_MAX_FILES) {
+            if(fs_info->files[file->file_id].thread_id == osThreadGetId()) {
+                if(filter == FDF_ANY) {
+                    // any type
+                    *filedata = &fs_info->files[file->file_id];
+                } else if(filter == FDF_FILE) {
+                    // file type
+                    if(!fs_info->files[file->file_id].is_dir) {
+                        *filedata = &fs_info->files[file->file_id];
+                    } else {
+                        error = SD_NOT_A_FILE;
+                    }
+                } else if(filter == FDF_DIR) {
+                    // dir type
+                    if(fs_info->files[file->file_id].is_dir) {
+                        *filedata = &fs_info->files[file->file_id];
+                    } else {
+                        error = SD_NOT_A_DIR;
+                    }
+                }
+            } else {
+                error = SD_OTHER_APP;
+            }
+        } else {
+            error = SD_INVALID_PARAMETER;
+        }
+    } else {
+        error = SD_NO_CARD;
+    }
+
+    _fs_unlock(fs_info);
+    return error;
+}
+
+SDError _get_file(SdFsInfo* fs_info, File* file, FileData** filedata) {
+    return _get_filedata(fs_info, file, filedata, FDF_FILE);
+}
+
+SDError _get_dir(SdFsInfo* fs_info, File* file, FileData** filedata) {
+    return _get_filedata(fs_info, file, filedata, FDF_DIR);
+}
+
+SDError _get_any(SdFsInfo* fs_info, File* file, FileData** filedata) {
+    return _get_filedata(fs_info, file, filedata, FDF_ANY);
+}
+
+SDError _fs_status(SdFsInfo* fs_info) {
+    SDError result;
+
+    _fs_lock(fs_info);
+    result = fs_info->status;
+    _fs_unlock(fs_info);
+
+    return result;
+}
+
+void _fs_on_client_app_exit(SdFsInfo* fs_info) {
+    _fs_lock(fs_info);
+    for(uint8_t i = 0; i < SD_FS_MAX_FILES; i++) {
+        if(fs_info->files[i].thread_id == osThreadGetId()) {
+            if(fs_info->files[i].is_dir) {
+                // TODO close dir
+            } else {
+                // TODO close file
+            }
+        }
+    }
+    _fs_unlock(fs_info);
+}
+
+FS_Error _fs_parse_error(SDError error) {
+    FS_Error result;
+    switch(error) {
+    case SD_OK:
+        result = FSE_OK;
+        break;
+    case SD_INT_ERR:
+        result = FSE_INTERNAL;
+        break;
+    case SD_NO_FILE:
+        result = FSE_NOT_EXIST;
+        break;
+    case SD_NO_PATH:
+        result = FSE_NOT_EXIST;
+        break;
+    case SD_INVALID_NAME:
+        result = FSE_INVALID_NAME;
+        break;
+    case SD_DENIED:
+        result = FSE_DENIED;
+        break;
+    case SD_EXIST:
+        result = FSE_EXIST;
+        break;
+    case SD_INVALID_OBJECT:
+        result = FSE_INTERNAL;
+        break;
+    case SD_WRITE_PROTECTED:
+        result = FSE_INTERNAL;
+        break;
+    case SD_INVALID_DRIVE:
+        result = FSE_INTERNAL;
+        break;
+    case SD_NOT_ENABLED:
+        result = FSE_INTERNAL;
+        break;
+    case SD_NO_FILESYSTEM:
+        result = FSE_NOT_READY;
+        break;
+    case SD_MKFS_ABORTED:
+        result = FSE_INTERNAL;
+        break;
+    case SD_TIMEOUT:
+        result = FSE_INTERNAL;
+        break;
+    case SD_LOCKED:
+        result = FSE_INTERNAL;
+        break;
+    case SD_NOT_ENOUGH_CORE:
+        result = FSE_INTERNAL;
+        break;
+    case SD_TOO_MANY_OPEN_FILES:
+        result = FSE_INTERNAL;
+        break;
+    case SD_INVALID_PARAMETER:
+        result = FSE_INVALID_PARAMETER;
+        break;
+    case SD_NO_CARD:
+        result = FSE_NOT_READY;
+        break;
+    case SD_NOT_A_FILE:
+        result = FSE_INVALID_PARAMETER;
+        break;
+    case SD_NOT_A_DIR:
+        result = FSE_INVALID_PARAMETER;
+        break;
+    case SD_OTHER_APP:
+        result = FSE_INTERNAL;
+        break;
+
+    default:
+        result = FSE_INTERNAL;
+        break;
+    }
+
+    return result;
+}
+
+/******************* File Functions *******************/
+
+// Open/Create a file
+bool fs_file_open(File* file, const char* path, FS_AccessMode access_mode, FS_OpenMode open_mode) {
+    SDFile* sd_file = NULL;
+
+    _fs_lock(fs_info);
+    for(uint8_t index = 0; index < SD_FS_MAX_FILES; index++) {
+        FileData* filedata = &fs_info->files[index];
+
+        if(filedata->thread_id == NULL) {
+            file->file_id = index;
+
+            memset(&(filedata->data), 0, sizeof(SDFileDirStorage));
+            filedata->thread_id = osThreadGetId();
+            filedata->is_dir = false;
+            sd_file = &(filedata->data.file);
+
+            break;
+        }
+    }
+    _fs_unlock(fs_info);
+
+    if(sd_file == NULL) {
+        file->internal_error_id = SD_TOO_MANY_OPEN_FILES;
+    } else {
+        uint8_t _mode = 0;
+
+        if(access_mode & FSAM_READ) _mode |= FA_READ;
+        if(access_mode & FSAM_WRITE) _mode |= FA_WRITE;
+        if(open_mode & FSOM_OPEN_EXISTING) _mode |= FA_OPEN_EXISTING;
+        if(open_mode & FSOM_OPEN_ALWAYS) _mode |= FA_OPEN_ALWAYS;
+        if(open_mode & FSOM_OPEN_APPEND) _mode |= FA_OPEN_APPEND;
+        if(open_mode & FSOM_CREATE_NEW) _mode |= FA_CREATE_NEW;
+        if(open_mode & FSOM_CREATE_ALWAYS) _mode |= FA_CREATE_ALWAYS;
+
+        file->internal_error_id = f_open(sd_file, path, _mode);
+    }
+
+    // TODO on exit
+    //furiac_onexit(_fs_on_client_app_exit, fs_info);
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+// Close an opened file
+bool fs_file_close(File* file) {
+    FileData* filedata = NULL;
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        file->internal_error_id = f_close(&filedata->data.file);
+
+        _fs_lock(fs_info);
+        filedata->thread_id = NULL;
+        _fs_unlock(fs_info);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+// Read data from the file
+uint16_t fs_file_read(File* file, void* buff, uint16_t const bytes_to_read) {
+    FileData* filedata = NULL;
+    uint16_t bytes_readed = 0;
+
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        file->internal_error_id = f_read(&filedata->data.file, buff, bytes_to_read, &bytes_readed);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return bytes_readed;
+}
+
+// Write data to the file
+uint16_t fs_file_write(File* file, void* buff, uint16_t const bytes_to_write) {
+    FileData* filedata = NULL;
+    uint16_t bytes_written = 0;
+
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        file->internal_error_id =
+            f_write(&filedata->data.file, buff, bytes_to_write, &bytes_written);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return bytes_written;
+}
+
+// Move read/write pointer, expand size
+bool fs_file_seek(File* file, const uint32_t offset, const bool from_start) {
+    FileData* filedata = NULL;
+
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        if(from_start) {
+            file->internal_error_id = f_lseek(&filedata->data.file, offset);
+        } else {
+            uint64_t position = f_tell(&filedata->data.file);
+            position += offset;
+            file->internal_error_id = f_lseek(&filedata->data.file, position);
+        }
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+// Tell pointer position
+uint64_t fs_file_tell(File* file) {
+    FileData* filedata = NULL;
+    uint64_t position = 0;
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        position = f_tell(&filedata->data.file);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return position;
+}
+
+// Truncate file size to current pointer value
+bool fs_file_truncate(File* file) {
+    FileData* filedata = NULL;
+    uint64_t position = 0;
+
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        file->internal_error_id = f_truncate(&filedata->data.file);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+// Flush cached data
+bool fs_file_sync(File* file) {
+    FileData* filedata = NULL;
+
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        file->internal_error_id = f_sync(&filedata->data.file);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+// Get size
+uint64_t fs_file_size(File* file) {
+    FileData* filedata = NULL;
+    uint64_t size = 0;
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        size = f_size(&filedata->data.file);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return size;
+}
+
+// Test EOF
+bool fs_file_eof(File* file) {
+    FileData* filedata = NULL;
+    bool eof = true;
+    file->internal_error_id = _get_file(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        eof = f_eof(&filedata->data.file);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return eof;
+}
+
+/******************* Dir Functions *******************/
+
+// Open directory
+bool fs_dir_open(File* file, const char* path) {
+    SDDir* sd_dir = NULL;
+
+    _fs_lock(fs_info);
+    for(uint8_t index = 0; index < SD_FS_MAX_FILES; index++) {
+        FileData* filedata = &fs_info->files[index];
+
+        if(filedata->thread_id == NULL) {
+            file->file_id = index;
+
+            memset(&(filedata->data), 0, sizeof(SDFileDirStorage));
+            filedata->thread_id = osThreadGetId();
+            filedata->is_dir = true;
+            sd_dir = &(filedata->data.dir);
+
+            break;
+        }
+    }
+    _fs_unlock(fs_info);
+
+    if(sd_dir == NULL) {
+        file->internal_error_id = SD_TOO_MANY_OPEN_FILES;
+    } else {
+        if(file->internal_error_id == SD_OK) file->internal_error_id = f_opendir(sd_dir, path);
+    }
+
+    // TODO on exit
+    //furiac_onexit(_fs_on_client_app_exit, fs_info);
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+// Close directory
+bool fs_dir_close(File* file) {
+    FileData* filedata = NULL;
+    file->internal_error_id = _get_dir(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        file->internal_error_id = f_closedir(&filedata->data.dir);
+
+        _fs_lock(fs_info);
+        filedata->thread_id = NULL;
+        _fs_unlock(fs_info);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+// Read next file info and name from directory
+bool fs_dir_read(File* file, FileInfo* fileinfo, char* name, const uint16_t name_length) {
+    FileData* filedata = NULL;
+    file->internal_error_id = _get_dir(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        SDFileInfo _fileinfo;
+        file->internal_error_id = f_readdir(&filedata->data.dir, &_fileinfo);
+
+        if(fileinfo != NULL) {
+            fileinfo->date.value = _fileinfo.fdate;
+            fileinfo->time.value = _fileinfo.ftime;
+            fileinfo->size = _fileinfo.fsize;
+            fileinfo->flags = 0;
+
+            if(_fileinfo.fattrib & AM_RDO) fileinfo->flags |= FSF_READ_ONLY;
+            if(_fileinfo.fattrib & AM_HID) fileinfo->flags |= FSF_HIDDEN;
+            if(_fileinfo.fattrib & AM_SYS) fileinfo->flags |= FSF_SYSTEM;
+            if(_fileinfo.fattrib & AM_DIR) fileinfo->flags |= FSF_DIRECTORY;
+            if(_fileinfo.fattrib & AM_ARC) fileinfo->flags |= FSF_ARCHIVE;
+        }
+
+        if(name != NULL && name_length > 0) {
+            strncpy(name, _fileinfo.fname, name_length);
+        }
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+bool fs_dir_rewind(File* file) {
+    FileData* filedata = NULL;
+    file->internal_error_id = _get_dir(fs_info, file, &filedata);
+
+    if(file->internal_error_id == SD_OK) {
+        file->internal_error_id = f_readdir(&filedata->data.dir, NULL);
+    }
+
+    file->error_id = _fs_parse_error(file->internal_error_id);
+    return (file->internal_error_id == SD_OK);
+}
+
+/******************* Common FS Functions *******************/
+
+// Get info about file/dir
+FS_Error
+fs_common_info(const char* path, FileInfo* fileinfo, char* name, const uint16_t name_length) {
+    SDFileInfo _fileinfo;
+    SDError fresult = _fs_status(fs_info);
+
+    if(fresult == SD_OK) {
+        fresult = f_stat(path, &_fileinfo);
+        if(fresult == FR_OK) {
+            if(fileinfo != NULL) {
+                fileinfo->date.value = _fileinfo.fdate;
+                fileinfo->time.value = _fileinfo.ftime;
+                fileinfo->size = _fileinfo.fsize;
+                fileinfo->flags = 0;
+
+                if(_fileinfo.fattrib & AM_RDO) fileinfo->flags |= FSF_READ_ONLY;
+                if(_fileinfo.fattrib & AM_HID) fileinfo->flags |= FSF_HIDDEN;
+                if(_fileinfo.fattrib & AM_SYS) fileinfo->flags |= FSF_SYSTEM;
+                if(_fileinfo.fattrib & AM_DIR) fileinfo->flags |= FSF_DIRECTORY;
+                if(_fileinfo.fattrib & AM_ARC) fileinfo->flags |= FSF_ARCHIVE;
+            }
+
+            if(name != NULL && name_length > 0) {
+                strncpy(name, _fileinfo.fname, name_length);
+            }
+        }
+    }
+
+    return _fs_parse_error(fresult);
+}
+
+// Delete file/dir
+// File/dir must not have read-only attribute.
+// File/dir must be empty.
+// File/dir must not be opened, or the FAT volume can be collapsed. FF_FS_LOCK fix that.
+FS_Error fs_common_remove(const char* path) {
+    SDError fresult = _fs_status(fs_info);
+
+    if(fresult == SD_OK) {
+        fresult = f_unlink(path);
+    }
+
+    return _fs_parse_error(fresult);
+}
+
+// Rename file/dir
+// File/dir must not be opened, or the FAT volume can be collapsed. FF_FS_LOCK fix that.
+FS_Error fs_common_rename(const char* old_path, const char* new_path) {
+    SDError fresult = _fs_status(fs_info);
+
+    if(fresult == SD_OK) {
+        fresult = f_rename(old_path, new_path);
+    }
+
+    return _fs_parse_error(fresult);
+}
+
+// Set attributes of file/dir
+// For example:
+// set "read only" flag and remove "hidden" flag
+// fs_common_set_attr("file.txt", FSF_READ_ONLY, FSF_READ_ONLY | FSF_HIDDEN);
+FS_Error fs_common_set_attr(const char* path, uint8_t attr, uint8_t mask) {
+    SDError fresult = _fs_status(fs_info);
+
+    if(fresult == SD_OK) {
+        uint8_t _mask = 0;
+        uint8_t _attr = 0;
+
+        if(mask & FSF_READ_ONLY) _mask |= AM_RDO;
+        if(mask & FSF_HIDDEN) _mask |= AM_HID;
+        if(mask & FSF_SYSTEM) _mask |= AM_SYS;
+        if(mask & FSF_DIRECTORY) _mask |= AM_DIR;
+        if(mask & FSF_ARCHIVE) _mask |= AM_ARC;
+
+        if(attr & FSF_READ_ONLY) _attr |= AM_RDO;
+        if(attr & FSF_HIDDEN) _attr |= AM_HID;
+        if(attr & FSF_SYSTEM) _attr |= AM_SYS;
+        if(attr & FSF_DIRECTORY) _attr |= AM_DIR;
+        if(attr & FSF_ARCHIVE) _attr |= AM_ARC;
+
+        fresult = f_chmod(path, attr, mask);
+    }
+
+    return _fs_parse_error(fresult);
+}
+
+// Set time of file/dir
+FS_Error fs_common_set_time(const char* path, FileDateUnion date, FileTimeUnion time) {
+    SDError fresult = _fs_status(fs_info);
+
+    if(fresult == SD_OK) {
+        SDFileInfo _fileinfo;
+
+        _fileinfo.fdate = date.value;
+        _fileinfo.ftime = time.value;
+
+        fresult = f_utime(path, &_fileinfo);
+    }
+
+    return _fs_parse_error(fresult);
+}
+
+// Create new directory
+FS_Error fs_common_mkdir(const char* path) {
+    SDError fresult = _fs_status(fs_info);
+
+    if(fresult == SD_OK) {
+        fresult = f_mkdir(path);
+    }
+
+    return _fs_parse_error(fresult);
+}
+
+// Get common info about FS
+FS_Error fs_get_fs_info(uint64_t* total_space, uint64_t* free_space) {
+    SDError fresult = _fs_status(fs_info);
+
+    if(fresult == SD_OK) {
+        DWORD free_clusters;
+        FATFS* fs;
+
+        fresult = f_getfree("0:/", &free_clusters, &fs);
+        if(fresult == FR_OK) {
+            uint32_t total_sectors = (fs->n_fatent - 2) * fs->csize;
+            uint32_t free_sectors = free_clusters * fs->csize;
+
+            uint16_t sector_size = _MAX_SS;
+#if _MAX_SS != _MIN_SS
+            sector_size = fs->ssize;
+#endif
+
+            if(total_space != NULL) {
+                *total_space = (uint64_t)total_sectors * (uint64_t)sector_size;
+            }
+
+            if(free_space != NULL) {
+                *free_space = (uint64_t)free_sectors * (uint64_t)sector_size;
+            }
+        }
+    }
+
+    return _fs_parse_error(fresult);
+}
+
+/******************* Error Reporting Functions *******************/
+
+// Get common error description
+const char* fs_error_get_desc(FS_Error error_id) {
+    const char* result;
+    switch(error_id) {
+    case(FSE_OK):
+        result = "OK";
+        break;
+    case(FSE_NOT_READY):
+        result = "filesystem not ready";
+        break;
+    case(FSE_EXIST):
+        result = "file/dir already exist";
+        break;
+    case(FSE_NOT_EXIST):
+        result = "file/dir not exist";
+        break;
+    case(FSE_INVALID_PARAMETER):
+        result = "invalid parameter";
+        break;
+    case(FSE_DENIED):
+        result = "access denied";
+        break;
+    case(FSE_INVALID_NAME):
+        result = "invalid name/path";
+        break;
+    case(FSE_INTERNAL):
+        result = "internal error";
+        break;
+    case(FSE_NOT_IMPLEMENTED):
+        result = "function not implemented";
+        break;
+    default:
+        result = "unknown error";
+        break;
+    }
+    return result;
+}
+
+// Get internal error description
+const char* fs_error_get_internal_desc(uint32_t internal_error_id) {
+    const char* result;
+    switch(internal_error_id) {
+    case(SD_OK):
+        result = "OK";
+        break;
+    case(SD_DISK_ERR):
+        result = "disk error";
+        break;
+    case(SD_INT_ERR):
+        result = "internal error";
+        break;
+    case(SD_NO_FILE):
+        result = "no file";
+        break;
+    case(SD_NO_PATH):
+        result = "no path";
+        break;
+    case(SD_INVALID_NAME):
+        result = "invalid name";
+        break;
+    case(SD_DENIED):
+        result = "access denied";
+        break;
+    case(SD_EXIST):
+        result = "file/dir exist";
+        break;
+    case(SD_INVALID_OBJECT):
+        result = "invalid object";
+        break;
+    case(SD_WRITE_PROTECTED):
+        result = "write protected";
+        break;
+    case(SD_INVALID_DRIVE):
+        result = "invalid drive";
+        break;
+    case(SD_NOT_ENABLED):
+        result = "not enabled";
+        break;
+    case(SD_NO_FILESYSTEM):
+        result = "no filesystem";
+        break;
+    case(SD_MKFS_ABORTED):
+        result = "aborted";
+        break;
+    case(SD_TIMEOUT):
+        result = "timeout";
+        break;
+    case(SD_LOCKED):
+        result = "file locked";
+        break;
+    case(SD_NOT_ENOUGH_CORE):
+        result = "not enough memory";
+        break;
+    case(SD_TOO_MANY_OPEN_FILES):
+        result = "too many open files";
+        break;
+    case(SD_INVALID_PARAMETER):
+        result = "invalid parameter";
+        break;
+    case(SD_NO_CARD):
+        result = "no SD Card";
+        break;
+    case(SD_NOT_A_FILE):
+        result = "not a file";
+        break;
+    case(SD_NOT_A_DIR):
+        result = "not a directory";
+        break;
+    case(SD_OTHER_APP):
+        result = "opened by other app";
+        break;
+    case(SD_LOW_LEVEL_ERR):
+        result = "low level error";
+        break;
+    default:
+        result = "unknown error";
+        break;
+    }
+    return result;
+}
\ No newline at end of file
diff --git a/applications/sd-filesystem/sd-filesystem.c b/applications/sd-filesystem/sd-filesystem.c
new file mode 100644
index 00000000..c9640e7b
--- /dev/null
+++ b/applications/sd-filesystem/sd-filesystem.c
@@ -0,0 +1,433 @@
+#include "fatfs.h"
+#include "filesystem-api.h"
+#include "sd-filesystem.h"
+#include "menu/menu.h"
+#include "menu/menu_item.h"
+
+FS_Api* fs_api_alloc() {
+    FS_Api* fs_api = furi_alloc(sizeof(FS_Api));
+
+    // fill file api
+    fs_api->file.open = fs_file_open;
+    fs_api->file.close = fs_file_close;
+    fs_api->file.read = fs_file_read;
+    fs_api->file.write = fs_file_write;
+    fs_api->file.seek = fs_file_seek;
+    fs_api->file.tell = fs_file_tell;
+    fs_api->file.truncate = fs_file_truncate;
+    fs_api->file.size = fs_file_size;
+    fs_api->file.sync = fs_file_sync;
+    fs_api->file.eof = fs_file_eof;
+
+    // fill dir api
+    fs_api->dir.open = fs_dir_open;
+    fs_api->dir.close = fs_dir_close;
+    fs_api->dir.read = fs_dir_read;
+    fs_api->dir.rewind = fs_dir_rewind;
+
+    // fill common api
+    fs_api->common.info = fs_common_info;
+    fs_api->common.remove = fs_common_remove;
+    fs_api->common.rename = fs_common_rename;
+    fs_api->common.set_attr = fs_common_set_attr;
+    fs_api->common.mkdir = fs_common_mkdir;
+    fs_api->common.set_time = fs_common_set_time;
+    fs_api->common.get_fs_info = fs_get_fs_info;
+
+    // fill errors api
+    fs_api->error.get_desc = fs_error_get_desc;
+    fs_api->error.get_internal_desc = fs_error_get_internal_desc;
+
+    return fs_api;
+}
+
+void sd_set_lines(SdApp* sd_app, uint8_t count, ...) {
+    va_list argptr;
+    count = min(count, SD_STATE_LINES_COUNT);
+
+    for(uint8_t i = 0; i < SD_STATE_LINES_COUNT; i++) {
+        sd_app->line[i] = "";
+    }
+
+    va_start(argptr, count);
+
+    for(uint8_t i = 0; i < count; i++) {
+        sd_app->line[i] = va_arg(argptr, char*);
+    }
+
+    va_end(argptr);
+}
+
+void sd_icon_draw_callback(Canvas* canvas, void* context) {
+    furi_assert(canvas);
+    furi_assert(context);
+    SdApp* sd_app = context;
+
+    switch(sd_app->info.status) {
+    case SD_NO_CARD:
+        break;
+    case SD_OK:
+        canvas_draw_icon(canvas, 0, 0, sd_app->icon.mounted);
+        break;
+    default:
+        canvas_draw_icon(canvas, 0, 0, sd_app->icon.fail);
+        break;
+    }
+}
+
+void sd_app_draw_callback(Canvas* canvas, void* context) {
+    furi_assert(canvas);
+    furi_assert(context);
+    SdApp* sd_app = context;
+
+    canvas_clear(canvas);
+    canvas_set_color(canvas, ColorBlack);
+    canvas_set_font(canvas, FontPrimary);
+
+    for(uint8_t i = 0; i < SD_STATE_LINES_COUNT; i++) {
+        canvas_draw_str(canvas, 0, (i + 1) * 10, sd_app->line[i]);
+    }
+}
+
+void sd_app_input_callback(InputEvent* event, void* context) {
+    furi_assert(context);
+    SdApp* sd_app = context;
+
+    osMessageQueuePut(sd_app->event_queue, event, 0, 0);
+}
+
+SdApp* sd_app_alloc() {
+    SdApp* sd_app = furi_alloc(sizeof(SdApp));
+
+    // init inner fs data
+    if(!_fs_init(&sd_app->info)) {
+        furiac_exit(NULL);
+    }
+
+    sd_app->event_queue = osMessageQueueNew(1, sizeof(InputEvent), NULL);
+
+    // init widget
+    sd_app->widget = widget_alloc();
+    widget_draw_callback_set(sd_app->widget, sd_app_draw_callback, sd_app);
+    widget_input_callback_set(sd_app->widget, sd_app_input_callback, sd_app);
+    widget_enabled_set(sd_app->widget, false);
+
+    // init lines
+    sd_set_lines(sd_app, 0);
+
+    // init icon widget
+    sd_app->icon.widget = widget_alloc();
+    sd_app->icon.mounted = assets_icons_get(I_SDcardMounted_11x8);
+    sd_app->icon.fail = assets_icons_get(I_SDcardFail_11x8);
+    widget_set_width(sd_app->icon.widget, icon_get_width(sd_app->icon.mounted));
+    widget_draw_callback_set(sd_app->icon.widget, sd_icon_draw_callback, sd_app);
+    widget_enabled_set(sd_app->icon.widget, false);
+
+    return sd_app;
+}
+
+bool app_sd_ask(SdApp* sd_app, Input input_true, Input input_false) {
+    bool result;
+
+    InputEvent event;
+    while(1) {
+        osStatus_t event_status =
+            osMessageQueueGet(sd_app->event_queue, &event, NULL, osWaitForever);
+
+        if(event_status == osOK) {
+            if(event.state && event.input == input_true) {
+                result = true;
+                break;
+            }
+            if(event.state && event.input == InputBack) {
+                result = false;
+                break;
+            }
+        }
+    }
+
+    return result;
+}
+
+void app_sd_info_callback(void* context) {
+    furi_assert(context);
+    SdApp* sd_app = context;
+    widget_enabled_set(sd_app->widget, true);
+
+    // dynamic strings
+    const uint8_t str_buffer_size = 26;
+    const uint8_t str_count = 6;
+    char* str_buffer[str_count];
+    bool memory_error = false;
+
+    // info vars
+    uint32_t serial_num;
+    SDError get_label_result, get_free_result;
+    FATFS* fs;
+    uint32_t free_clusters, free_sectors, total_sectors;
+    char volume_label[34];
+
+    // init strings
+    for(uint8_t i = 0; i < str_count; i++) {
+        str_buffer[i] = malloc(str_buffer_size + 1);
+        if(str_buffer[i] == NULL) {
+            memory_error = true;
+        } else {
+            snprintf(str_buffer[i], str_buffer_size, "");
+        }
+    }
+
+    if(memory_error) {
+        sd_set_lines(sd_app, 1, "not enough memory");
+    } else {
+        // get fs info
+        _fs_lock(&sd_app->info);
+        get_label_result = f_getlabel(sd_app->info.path, volume_label, &serial_num);
+        get_free_result = f_getfree(sd_app->info.path, &free_clusters, &fs);
+        _fs_unlock(&sd_app->info);
+
+        // calculate size
+        total_sectors = (fs->n_fatent - 2) * fs->csize;
+        free_sectors = free_clusters * fs->csize;
+        uint16_t sector_size = _MAX_SS;
+#if _MAX_SS != _MIN_SS
+        sector_size = fs->ssize;
+#endif
+
+        // output info to dynamic strings
+        if(get_label_result == SD_OK && get_free_result == SD_OK) {
+            snprintf(str_buffer[0], str_buffer_size, "%s", volume_label);
+
+            const char* fs_type = "";
+
+            switch(fs->fs_type) {
+            case(FS_FAT12):
+                fs_type = "FAT12";
+                break;
+            case(FS_FAT16):
+                fs_type = "FAT16";
+                break;
+            case(FS_FAT32):
+                fs_type = "FAT32";
+                break;
+            case(FS_EXFAT):
+                fs_type = "EXFAT";
+                break;
+            default:
+                fs_type = "UNKNOWN";
+                break;
+            }
+
+            snprintf(str_buffer[1], str_buffer_size, "%s, S/N: %lu", fs_type, serial_num);
+
+            snprintf(str_buffer[2], str_buffer_size, "Cluster: %d sectors", fs->csize);
+            snprintf(str_buffer[3], str_buffer_size, "Sector: %d bytes", sector_size);
+            snprintf(
+                str_buffer[4], str_buffer_size, "%lu KB total", total_sectors / 1024 * sector_size);
+            snprintf(
+                str_buffer[5], str_buffer_size, "%lu KB free", free_sectors / 1024 * sector_size);
+        } else {
+            snprintf(str_buffer[0], str_buffer_size, "SD status error:");
+            snprintf(
+                str_buffer[1],
+                str_buffer_size,
+                "%s",
+                fs_error_get_internal_desc(_fs_status(&sd_app->info)));
+            snprintf(str_buffer[2], str_buffer_size, "Label error:");
+            snprintf(
+                str_buffer[3], str_buffer_size, "%s", fs_error_get_internal_desc(get_label_result));
+            snprintf(str_buffer[4], str_buffer_size, "Get free error:");
+            snprintf(
+                str_buffer[5], str_buffer_size, "%s", fs_error_get_internal_desc(get_free_result));
+        }
+
+        // dynamic strings to screen
+        sd_set_lines(
+            sd_app,
+            6,
+            str_buffer[0],
+            str_buffer[1],
+            str_buffer[2],
+            str_buffer[3],
+            str_buffer[4],
+            str_buffer[5]);
+    }
+
+    app_sd_ask(sd_app, InputBack, InputBack);
+
+    sd_set_lines(sd_app, 0);
+    widget_enabled_set(sd_app->widget, false);
+
+    for(uint8_t i = 0; i < str_count; i++) {
+        free(str_buffer[i]);
+    }
+}
+
+void app_sd_format_callback(void* context) {
+    furi_assert(context);
+    SdApp* sd_app = context;
+    uint8_t* work_area;
+
+    // ask to really format
+    sd_set_lines(sd_app, 2, "Press UP to format", "or BACK to exit");
+    widget_enabled_set(sd_app->widget, true);
+
+    // wait for input
+    if(!app_sd_ask(sd_app, InputUp, InputBack)) {
+        widget_enabled_set(sd_app->widget, false);
+        return;
+    }
+
+    // show warning
+    sd_set_lines(sd_app, 3, "formatting SD card", "procedure can be lengthy", "please wait");
+
+    // format card
+    _fs_lock(&sd_app->info);
+    work_area = malloc(_MAX_SS);
+    if(work_area == NULL) {
+        sd_app->info.status = SD_NOT_ENOUGH_CORE;
+    } else {
+        sd_app->info.status = f_mkfs(sd_app->info.path, FM_ANY, 0, work_area, _MAX_SS);
+        free(work_area);
+
+        if(sd_app->info.status == SD_OK) {
+            // set label and mount card
+            f_setlabel("Flipper SD");
+            sd_app->info.status = f_mount(&sd_app->info.fat_fs, sd_app->info.path, 1);
+        }
+    }
+
+    if(sd_app->info.status != SD_OK) {
+        sd_set_lines(
+            sd_app, 2, "SD card format error", fs_error_get_internal_desc(sd_app->info.status));
+    } else {
+        sd_set_lines(sd_app, 1, "SD card formatted");
+    }
+
+    _fs_unlock(&sd_app->info);
+
+    // wait for BACK
+    app_sd_ask(sd_app, InputBack, InputBack);
+
+    widget_enabled_set(sd_app->widget, false);
+}
+
+void app_sd_unmount_card(SdApp* sd_app) {
+    _fs_lock(&sd_app->info);
+
+    // set status
+    sd_app->info.status = SD_NO_CARD;
+    widget_enabled_set(sd_app->icon.widget, false);
+
+    // close files
+    for(uint8_t index = 0; index < SD_FS_MAX_FILES; index++) {
+        FileData* filedata = &sd_app->info.files[index];
+
+        if(filedata->thread_id != NULL) {
+            if(filedata->is_dir) {
+                f_closedir(&filedata->data.dir);
+            } else {
+                f_close(&filedata->data.file);
+            }
+            filedata->thread_id = NULL;
+        }
+    }
+
+    // unmount volume
+    f_mount(0, sd_app->info.path, 0);
+
+    _fs_unlock(&sd_app->info);
+}
+
+void app_sd_eject_callback(void* context) {
+    furi_assert(context);
+    SdApp* sd_app = context;
+
+    sd_set_lines(sd_app, 1, "ejecting SD card");
+    widget_enabled_set(sd_app->widget, true);
+
+    app_sd_unmount_card(sd_app);
+
+    sd_set_lines(sd_app, 1, "SD card can be pulled out");
+
+    // wait for BACK
+    app_sd_ask(sd_app, InputBack, InputBack);
+
+    widget_enabled_set(sd_app->widget, false);
+}
+
+void sd_filesystem(void* p) {
+    SdApp* sd_app = sd_app_alloc();
+    FS_Api* fs_api = fs_api_alloc();
+
+    Gui* gui = furi_open("gui");
+    gui_add_widget(gui, sd_app->widget, GuiLayerFullscreen);
+    gui_add_widget(gui, sd_app->icon.widget, GuiLayerStatusBarLeft);
+
+    // add api record
+    if(!furi_create("sdcard", fs_api)) {
+        furiac_exit(NULL);
+    }
+
+    // init menu
+    // TODO menu icon
+    MenuItem* menu_item;
+    menu_item = menu_item_alloc_menu("SD Card", assets_icons_get(I_SDcardMounted_11x8));
+
+    menu_item_subitem_add(
+        menu_item, menu_item_alloc_function("Info", NULL, app_sd_info_callback, sd_app));
+    menu_item_subitem_add(
+        menu_item, menu_item_alloc_function("Format", NULL, app_sd_format_callback, sd_app));
+    menu_item_subitem_add(
+        menu_item, menu_item_alloc_function("Eject", NULL, app_sd_eject_callback, sd_app));
+
+    // add item to menu
+    ValueMutex* menu_vm = furi_open("menu");
+    furi_check(menu_vm);
+    with_value_mutex(
+        menu_vm, (Menu * menu) { menu_item_add(menu, menu_item); });
+
+    furiac_ready();
+
+    printf("[sd_filesystem] start\n");
+
+    // sd card cycle
+    bool sd_was_present = true;
+
+    while(true) {
+        if(sd_was_present) {
+            if(hal_gpio_read_sd_detect()) {
+                printf("[sd_filesystem] card detected\n");
+
+                uint8_t bsp_result = BSP_SD_Init();
+
+                if(bsp_result) {
+                    sd_app->info.status = SD_LOW_LEVEL_ERR;
+                    printf("[sd_filesystem] bsp error: %x\n", bsp_result);
+                } else {
+                    printf("[sd_filesystem] bsp ok\n");
+                    sd_app->info.status = f_mount(&sd_app->info.fat_fs, sd_app->info.path, 1);
+
+                    if(sd_app->info.status != SD_OK) {
+                        printf("[sd_filesystem] mount error: %d\n", sd_app->info.status);
+                    } else {
+                        printf("[sd_filesystem] mount ok\n");
+                    }
+                }
+
+                widget_enabled_set(sd_app->icon.widget, true);
+                sd_was_present = false;
+            }
+        } else {
+            if(!hal_gpio_read_sd_detect()) {
+                printf("[sd_filesystem] card removed\n");
+
+                widget_enabled_set(sd_app->icon.widget, false);
+                app_sd_unmount_card(sd_app);
+                sd_was_present = true;
+            }
+        }
+
+        delay(1000);
+    }
+}
\ No newline at end of file
diff --git a/applications/sd-filesystem/sd-filesystem.h b/applications/sd-filesystem/sd-filesystem.h
new file mode 100644
index 00000000..171de48c
--- /dev/null
+++ b/applications/sd-filesystem/sd-filesystem.h
@@ -0,0 +1,122 @@
+#pragma once
+#include "flipper.h"
+#include "flipper_v2.h"
+
+#define SD_FS_MAX_FILES _FS_LOCK
+#define SD_STATE_LINES_COUNT 6
+
+#ifndef min
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+#endif
+
+/* api data */
+typedef FIL SDFile;
+typedef DIR SDDir;
+typedef FILINFO SDFileInfo;
+
+/* storage for file/directory objects*/
+typedef union {
+    SDFile file;
+    SDDir dir;
+} SDFileDirStorage;
+
+typedef enum {
+    SD_OK = FR_OK,
+    SD_DISK_ERR = FR_DISK_ERR,
+    SD_INT_ERR = FR_INT_ERR,
+    SD_NO_FILE = FR_NO_FILE,
+    SD_NO_PATH = FR_NO_PATH,
+    SD_INVALID_NAME = FR_INVALID_NAME,
+    SD_DENIED = FR_DENIED,
+    SD_EXIST = FR_EXIST,
+    SD_INVALID_OBJECT = FR_INVALID_OBJECT,
+    SD_WRITE_PROTECTED = FR_WRITE_PROTECTED,
+    SD_INVALID_DRIVE = FR_INVALID_DRIVE,
+    SD_NOT_ENABLED = FR_NOT_ENABLED,
+    SD_NO_FILESYSTEM = FR_NO_FILESYSTEM,
+    SD_MKFS_ABORTED = FR_MKFS_ABORTED,
+    SD_TIMEOUT = FR_TIMEOUT,
+    SD_LOCKED = FR_LOCKED,
+    SD_NOT_ENOUGH_CORE = FR_NOT_ENOUGH_CORE,
+    SD_TOO_MANY_OPEN_FILES = FR_TOO_MANY_OPEN_FILES,
+    SD_INVALID_PARAMETER = FR_INVALID_PARAMETER,
+    SD_NO_CARD,
+    SD_NOT_A_FILE,
+    SD_NOT_A_DIR,
+    SD_OTHER_APP,
+    SD_LOW_LEVEL_ERR,
+} SDError;
+
+typedef enum {
+    FDF_DIR,
+    FDF_FILE,
+    FDF_ANY,
+} FiledataFilter;
+
+typedef struct {
+    osThreadId_t thread_id;
+    bool is_dir;
+    SDFileDirStorage data;
+} FileData;
+
+/* application data */
+typedef struct {
+    Widget* widget;
+    Icon* mounted;
+    Icon* fail;
+} SdFsIcon;
+
+typedef struct {
+    osMutexId_t mutex;
+    FileData files[SD_FS_MAX_FILES];
+    SDError status;
+    char* path;
+    FATFS fat_fs;
+} SdFsInfo;
+
+typedef struct {
+    SdFsInfo info;
+    SdFsIcon icon;
+
+    Widget* widget;
+    const char* line[SD_STATE_LINES_COUNT];
+    osMessageQueueId_t event_queue;
+} SdApp;
+
+/* core api fns */
+bool _fs_init(SdFsInfo* _fs_info);
+bool _fs_lock(SdFsInfo* fs_info);
+bool _fs_unlock(SdFsInfo* fs_info);
+SDError _fs_status(SdFsInfo* fs_info);
+
+/* sd api fns */
+bool fs_file_open(File* file, const char* path, FS_AccessMode access_mode, FS_OpenMode open_mode);
+bool fs_file_close(File* file);
+uint16_t fs_file_read(File* file, void* buff, uint16_t bytes_to_read);
+uint16_t fs_file_write(File* file, void* buff, uint16_t bytes_to_write);
+bool fs_file_seek(File* file, uint32_t offset, bool from_start);
+uint64_t fs_file_tell(File* file);
+bool fs_file_truncate(File* file);
+uint64_t fs_file_size(File* file);
+bool fs_file_sync(File* file);
+bool fs_file_eof(File* file);
+
+/* dir api */
+bool fs_dir_open(File* file, const char* path);
+bool fs_dir_close(File* file);
+bool fs_dir_read(File* file, FileInfo* fileinfo, char* name, uint16_t name_length);
+bool fs_dir_rewind(File* file);
+
+/* common api */
+FS_Error
+fs_common_info(const char* path, FileInfo* fileinfo, char* name, const uint16_t name_length);
+FS_Error fs_common_remove(const char* path);
+FS_Error fs_common_rename(const char* old_path, const char* new_path);
+FS_Error fs_common_set_attr(const char* path, uint8_t attr, uint8_t mask);
+FS_Error fs_common_mkdir(const char* path);
+FS_Error fs_common_set_time(const char* path, FileDateUnion date, FileTimeUnion time);
+FS_Error fs_get_fs_info(uint64_t* total_space, uint64_t* free_space);
+
+/* errors api */
+const char* fs_error_get_desc(FS_Error error_id);
+const char* fs_error_get_internal_desc(uint32_t internal_error_id);
\ No newline at end of file
diff --git a/firmware/targets/f4/Src/fatfs/ffconf.h b/firmware/targets/f4/Src/fatfs/ffconf.h
index 3de4837b..0662e63d 100644
--- a/firmware/targets/f4/Src/fatfs/ffconf.h
+++ b/firmware/targets/f4/Src/fatfs/ffconf.h
@@ -47,7 +47,7 @@
 /   2: f_opendir(), f_readdir() and f_closedir() are removed in addition to 1.
 /   3: f_lseek() function is removed in addition to 2. */
 
-#define _USE_STRFUNC         2      /* 0:Disable or 1-2:Enable */
+#define _USE_STRFUNC         0      /* 0:Disable or 1-2:Enable */
 /* This option switches string functions, f_gets(), f_putc(), f_puts() and
 /  f_printf().
 /
@@ -68,7 +68,7 @@
 #define	_USE_EXPAND		0
 /* This option switches f_expand function. (0:Disable or 1:Enable) */
 
-#define _USE_CHMOD		0
+#define _USE_CHMOD		1
 /* This option switches attribute manipulation functions, f_chmod() and f_utime().
 /  (0:Disable or 1:Enable) Also _FS_READONLY needs to be 0 to enable this option. */
 
@@ -177,7 +177,7 @@
 /  arbitrary physical drive and partition listed in the VolToPart[]. Also f_fdisk()
 /  funciton will be available. */
 #define _MIN_SS    512  /* 512, 1024, 2048 or 4096 */
-#define _MAX_SS    4096  /* 512, 1024, 2048 or 4096 */
+#define _MAX_SS    512  /* 512, 1024, 2048 or 4096 */
 /* These options configure the range of sector size to be supported. (512, 1024,
 /  2048 or 4096) Always set both 512 for most systems, all type of memory cards and
 /  harddisk. But a larger value may be required for on-board flash memory and some
diff --git a/firmware/targets/f4/api-hal/api-hal-gpio.c b/firmware/targets/f4/api-hal/api-hal-gpio.c
index 74de4785..1827a88a 100644
--- a/firmware/targets/f4/api-hal/api-hal-gpio.c
+++ b/firmware/targets/f4/api-hal/api-hal-gpio.c
@@ -1,5 +1,6 @@
 #include "api-hal-gpio.h"
 #include "api-hal-resources.h"
+#include "spi.h"
 
 // init GPIO
 void hal_gpio_init(
@@ -20,20 +21,27 @@ void hal_gpio_init(
 
 bool hal_gpio_read_sd_detect(void) {
     bool result = false;
-    
+
     // TODO open record
     const GpioPin* sd_cs_record = &sd_cs_gpio;
 
+    // TODO: SPI manager
+    api_hal_spi_lock(&SPI_SD_HANDLE);
+
     // configure pin as input
     gpio_init_ex(sd_cs_record, GpioModeInput, GpioPullUp, GpioSpeedVeryHigh);
-    delay(50);
+    delay(1);
 
     // if gpio_read == 0 return true else return false
     result = !gpio_read(sd_cs_record);
 
     // configure pin back
     gpio_init_ex(sd_cs_record, GpioModeOutputPushPull, GpioPullNo, GpioSpeedVeryHigh);
-    delay(50);
+    gpio_write(sd_cs_record, 1);
+    delay(1);
+
+    // TODO: SPI manager
+    api_hal_spi_unlock(&SPI_SD_HANDLE);
 
     return result;
 }
diff --git a/lib/common-api/filesystem-api.h b/lib/common-api/filesystem-api.h
new file mode 100644
index 00000000..5a710b0e
--- /dev/null
+++ b/lib/common-api/filesystem-api.h
@@ -0,0 +1,330 @@
+#pragma once
+#include "flipper.h"
+#include "flipper_v2.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *  @brief Access mode flags
+ */
+typedef enum {
+    FSAM_READ = (1 << 0), /**< Read access */
+    FSAM_WRITE = (1 << 1), /**< Write access */
+} FS_AccessMode;
+
+/**
+ *  @brief Open mode flags
+ */
+typedef enum {
+    FSOM_OPEN_EXISTING = 1, /**< Open file, fail if file doesn't exist */
+    FSOM_OPEN_ALWAYS = 2, /**< Open file. Create new file if not exist */
+    FSOM_OPEN_APPEND = 4, /**< Open file. Create new file if not exist. Set R/W pointer to EOF */
+    FSOM_CREATE_NEW = 8, /**< Creates a new file. Fails if the file is exist */
+    FSOM_CREATE_ALWAYS = 16, /**< Creates a new file. If file exist, truncate to zero size */
+} FS_OpenMode;
+
+/**
+ *  @brief API errors enumeration
+ */
+typedef enum {
+    FSE_OK, /**< No error */
+    FSE_NOT_READY, /**< FS not ready */
+    FSE_EXIST, /**< File/Dir alrady exist */
+    FSE_NOT_EXIST, /**< File/Dir does not exist */
+    FSE_INVALID_PARAMETER, /**< Invalid API parameter */
+    FSE_DENIED, /**< Access denied */
+    FSE_INVALID_NAME, /**< Invalid name/path */
+    FSE_INTERNAL, /**< Internal error */
+    FSE_NOT_IMPLEMENTED, /**< Functon not implemented */
+} FS_Error;
+
+/**
+ *  @brief FileInfo flags
+ */
+typedef enum {
+    FSF_READ_ONLY = (1 << 0), /**< Readonly */
+    FSF_HIDDEN = (1 << 1), /**< Hidden */
+    FSF_SYSTEM = (1 << 2), /**< System */
+    FSF_DIRECTORY = (1 << 3), /**< Directory */
+    FSF_ARCHIVE = (1 << 4), /**< Archive */
+} FS_Flags;
+
+/** 
+ *  @brief Structure that hold file index and returned api errors 
+ */
+typedef struct {
+    uint32_t file_id; /**< File ID for internal references */
+    FS_Error error_id; /**< Standart API error from FS_Error enum */
+    uint32_t internal_error_id; /**< Internal API error value */
+} File;
+
+// TODO: solve year 2107 problem
+/** 
+ *  @brief Structure that hold packed date values 
+ */
+typedef struct __attribute__((packed)) {
+    uint16_t month_day : 5; /**< month day */
+    uint16_t month : 4; /**< month index */
+    uint16_t year : 7; /**< year, year + 1980 to get actual value */
+} FileDate;
+
+/** 
+ *  @brief Structure that hold packed time values 
+ */
+typedef struct __attribute__((packed)) {
+    uint16_t second : 5; /**< second, second * 2 to get actual value  */
+    uint16_t minute : 6; /**< minute */
+    uint16_t hour : 5; /**< hour */
+} FileTime;
+
+/** 
+ *  @brief Union of simple date and real value 
+ */
+typedef union {
+    FileDate simple; /**< simple access to date */
+    uint16_t value; /**< real date value */
+} FileDateUnion;
+
+/** 
+ *  @brief Union of simple time and real value 
+ */
+typedef union {
+    FileTime simple; /**< simple access to time */
+    uint16_t value; /**< real time value */
+} FileTimeUnion;
+
+/** 
+ *  @brief Structure that hold file info
+ */
+typedef struct {
+    uint8_t flags; /**< flags from FS_Flags enum */
+    uint64_t size; /**< file size */
+    FileDateUnion date; /**< file date */
+    FileTimeUnion time; /**< file time */
+} FileInfo;
+
+/** @struct FS_File_Api
+ *  @brief File api structure
+ * 
+ *  @var FS_File_Api::open
+ *      @brief Open file
+ *      @param file pointer to file object, filled by api
+ *      @param path path to file 
+ *      @param access_mode access mode from FS_AccessMode 
+ *      @param open_mode open mode from FS_OpenMode 
+ *      @return success flag
+ * 
+ *  @var FS_File_Api::close 
+ *      @brief Close file
+ *      @param file pointer to file object
+ *      @return success flag
+ * 
+ *  @var FS_File_Api::read
+ *      @brief Read bytes from file to buffer
+ *      @param file pointer to file object
+ *      @param buff pointer to buffer for reading
+ *      @param bytes_to_read how many bytes to read, must be smaller or equal to buffer size 
+ *      @return how many bytes actually has been readed
+ * 
+ *  @var FS_File_Api::write
+ *      @brief Write bytes from buffer to file
+ *      @param file pointer to file object
+ *      @param buff pointer to buffer for writing
+ *      @param bytes_to_read how many bytes to write, must be smaller or equal to buffer size 
+ *      @return how many bytes actually has been writed
+ * 
+ *  @var FS_File_Api::seek
+ *      @brief Move r/w pointer 
+ *      @param file pointer to file object
+ *      @param offset offset to move r/w pointer
+ *      @param from_start set offset from start, or from current position
+ *      @return success flag
+ * 
+ *  @var FS_File_Api::tell
+ *      @brief Get r/w pointer position
+ *      @param file pointer to file object
+ *      @return current r/w pointer position
+ * 
+ *  @var FS_File_Api::truncate
+ *      @brief Truncate file size to current r/w pointer position
+ *      @param file pointer to file object
+ *      @return success flag
+ * 
+ *  @var FS_File_Api::size
+ *      @brief Fet file size
+ *      @param file pointer to file object
+ *      @return file size
+ * 
+ *  @var FS_File_Api::sync
+ *      @brief Write file cache to storage
+ *      @param file pointer to file object
+ *      @return success flag
+ * 
+ *  @var FS_File_Api::eof
+ *      @brief Checks that the r/w pointer is at the end of the file
+ *      @param file pointer to file object
+ *      @return end of file flag
+ */
+
+/**
+ * @brief File api structure
+ */
+typedef struct {
+    bool (*open)(File* file, const char* path, FS_AccessMode access_mode, FS_OpenMode open_mode);
+    bool (*close)(File* file);
+    uint16_t (*read)(File* file, void* buff, uint16_t bytes_to_read);
+    uint16_t (*write)(File* file, void* buff, uint16_t bytes_to_write);
+    bool (*seek)(File* file, uint32_t offset, bool from_start);
+    uint64_t (*tell)(File* file);
+    bool (*truncate)(File* file);
+    uint64_t (*size)(File* file);
+    bool (*sync)(File* file);
+    bool (*eof)(File* file);
+} FS_File_Api;
+
+/** @struct FS_Dir_Api
+ *  @brief Dir api structure
+ * 
+ *  @var FS_Dir_Api::open
+ *      @brief Open directory to get objects from
+ *      @param file pointer to file object, filled by api
+ *      @param path path to directory 
+ *      @return success flag
+ * 
+ *  @var FS_Dir_Api::close 
+ *      @brief Close directory
+ *      @param file pointer to file object
+ *      @return success flag
+ * 
+ *  @var FS_Dir_Api::read
+ *      @brief Read next object info in directory
+ *      @param file pointer to file object
+ *      @param fileinfo pointer to readed FileInfo, can be NULL
+ *      @param name pointer to name buffer, can be NULL
+ *      @param name_length name buffer length
+ *      @return success flag (if next object not exist also returns false and set error_id to FSE_NOT_EXIST)
+ * 
+ *  @var FS_Dir_Api::rewind
+ *      @brief Rewind to first object info in directory
+ *      @param file pointer to file object
+ *      @return success flag
+ */
+
+/**
+ * @brief Dir api structure
+ */
+typedef struct {
+    bool (*open)(File* file, const char* path);
+    bool (*close)(File* file);
+    bool (*read)(File* file, FileInfo* fileinfo, char* name, uint16_t name_length);
+    bool (*rewind)(File* file);
+} FS_Dir_Api;
+
+/** @struct FS_Common_Api
+ *  @brief Common api structure
+ * 
+ *  @var FS_Common_Api::info
+ *      @brief Open directory to get objects from
+ *      @param path path to file/directory
+ *      @param fileinfo pointer to readed FileInfo, can be NULL
+ *      @param name pointer to name buffer, can be NULL
+ *      @param name_length name buffer length
+ *      @return FS_Error error info
+ * 
+ *  @var FS_Common_Api::remove
+ *      @brief Remove file/directory from storage, 
+ *          directory must be empty,
+ *          file/directory must not be opened,
+ *          file/directory must not have FSF_READ_ONLY flag
+ *      @param path path to file/directory
+ *      @return FS_Error error info
+ * 
+ *  @var FS_Common_Api::rename
+ *      @brief Rename file/directory,
+ *          file/directory must not be opened
+ *      @param path path to file/directory
+ *      @return FS_Error error info
+ * 
+ *  @var FS_Common_Api::set_attr
+ *      @brief Set attributes of file/directory, 
+ *          for example:
+ *          @code
+ *          set "read only" flag and remove "hidden" flag
+ *          set_attr("file.txt", FSF_READ_ONLY, FSF_READ_ONLY | FSF_HIDDEN);
+ *          @endcode
+ *      @param path path to file/directory
+ *      @param attr attribute values consist of FS_Flags
+ *      @param mask attribute mask consist of FS_Flags
+ *      @return FS_Error error info
+ * 
+ *  @var FS_Common_Api::mkdir
+ *      @brief Create new directory
+ *      @param path path to new directory
+ *      @return FS_Error error info
+ * 
+ *  @var FS_Common_Api::set_time
+ *      @brief Set file/directory modification time
+ *      @param path path to file/directory
+ *      @param date modification date 
+ *      @param time modification time
+ *      @see FileDateUnion
+ *      @see FileTimeUnion
+ *      @return FS_Error error info
+ * 
+ *  @var FS_Common_Api::get_fs_info
+ *      @brief Get total and free space storage values
+ *      @param total_space pointer to total space value
+ *      @param free_space pointer to free space value
+ *      @return FS_Error error info
+ */
+
+/**
+ * @brief Common api structure
+ */
+typedef struct {
+    FS_Error (*info)(const char* path, FileInfo* fileinfo, char* name, const uint16_t name_length);
+    FS_Error (*remove)(const char* path);
+    FS_Error (*rename)(const char* old_path, const char* new_path);
+    FS_Error (*set_attr)(const char* path, uint8_t attr, uint8_t mask);
+    FS_Error (*mkdir)(const char* path);
+    FS_Error (*set_time)(const char* path, FileDateUnion date, FileTimeUnion time);
+    FS_Error (*get_fs_info)(uint64_t* total_space, uint64_t* free_space);
+} FS_Common_Api;
+
+/** @struct FS_Error_Api
+ *  @brief Errors api structure
+ * 
+ *  @var FS_Error_Api::get_desc
+ *      @brief Get error description text
+ *      @param error_id FS_Error error id (for fire/dir functions result can be obtained from File.error_id)
+ *      @return pointer to description text
+ * 
+ *  @var FS_Error_Api::get_internal_desc
+ *      @brief Get internal error description text
+ *      @param internal_error_id error id (for fire/dir functions result can be obtained from File.internal_error_id)
+ *      @return pointer to description text
+ */
+
+/**
+ * @brief Errors api structure
+ */
+typedef struct {
+    const char* (*get_desc)(FS_Error error_id);
+    const char* (*get_internal_desc)(uint32_t internal_error_id);
+} FS_Error_Api;
+
+/**
+ * @brief Full filesystem api structure
+ */
+typedef struct {
+    FS_File_Api file;
+    FS_Dir_Api dir;
+    FS_Common_Api common;
+    FS_Error_Api error;
+} FS_Api;
+
+#ifdef __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/lib/fatfs/integer.h b/lib/fatfs/integer.h
index 9ce7865b..efef2984 100644
--- a/lib/fatfs/integer.h
+++ b/lib/fatfs/integer.h
@@ -5,33 +5,33 @@
 #ifndef _FF_INTEGER
 #define _FF_INTEGER
 
-#ifdef _WIN32	/* FatFs development platform */
+#ifdef _WIN32 /* FatFs development platform */
 
 #include <windows.h>
 #include <tchar.h>
 typedef unsigned __int64 QWORD;
 
-
-#else			/* Embedded platform */
+#else /* Embedded platform */
+#include <stdint.h>
 
 /* These types MUST be 16-bit or 32-bit */
-typedef int				INT;
-typedef unsigned int	UINT;
+typedef int16_t INT;
+typedef uint16_t UINT;
 
 /* This type MUST be 8-bit */
-typedef unsigned char	BYTE;
+typedef uint8_t BYTE;
 
 /* These types MUST be 16-bit */
-typedef short			SHORT;
-typedef unsigned short	WORD;
-typedef unsigned short	WCHAR;
+typedef int16_t SHORT;
+typedef uint16_t WORD;
+typedef uint16_t WCHAR;
 
 /* These types MUST be 32-bit */
-typedef long			LONG;
-typedef unsigned long	DWORD;
+typedef int32_t LONG;
+typedef uint32_t DWORD;
 
 /* This type MUST be 64-bit (Remove this for ANSI C (C89) compatibility) */
-typedef unsigned long long QWORD;
+typedef uint64_t QWORD;
 
 #endif
 
diff --git a/lib/lib.mk b/lib/lib.mk
index 6da48f67..b1813d7c 100644
--- a/lib/lib.mk
+++ b/lib/lib.mk
@@ -70,6 +70,9 @@ CFLAGS			+= -I$(CYFRAL_DIR)
 CPP_SOURCES		+= $(wildcard $(CYFRAL_DIR)/*.cpp)
 endif
 
+# common apps api
+CFLAGS			+= -I$(LIB_DIR)/common-api
+
 # drivers
 ifneq ($(TARGET), local)
 ifneq ($(TARGET), f2)