diff --git a/firmware/export/kernel.h b/firmware/export/kernel.h
index 8b55a57daa..b8f2b906fd 100644
--- a/firmware/export/kernel.h
+++ b/firmware/export/kernel.h
@@ -66,6 +66,8 @@
 #define SYS_USB_DISCONNECTED      MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 2)
 #define SYS_USB_DISCONNECTED_ACK  MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 3)
 #define SYS_USB_LUN_LOCKED        MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 4)
+#define SYS_USB_READ_DATA         MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 5)
+#define SYS_USB_WRITE_DATA        MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 6)
 #define SYS_POWEROFF              MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 0)
 #define SYS_CHARGER_CONNECTED     MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 1)
 #define SYS_CHARGER_DISCONNECTED  MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 2)
diff --git a/firmware/usbstack/usb_storage.c b/firmware/usbstack/usb_storage.c
index ed9efd67c3..5f28638224 100644
--- a/firmware/usbstack/usb_storage.c
+++ b/firmware/usbstack/usb_storage.c
@@ -966,6 +966,7 @@ static void handle_scsi(struct command_block_wrapper* cbw)
                 cbw->command_block[8]);
 
             //logf("scsi read %d %d", cur_cmd.sector, cur_cmd.count);
+            queue_broadcast(SYS_USB_READ_DATA, (lun<<16)+cur_cmd.count);
 
             if((cur_cmd.sector + cur_cmd.count) > block_count) {
                 send_csw(UMS_STATUS_FAIL);
@@ -1015,6 +1016,8 @@ static void handle_scsi(struct command_block_wrapper* cbw)
             cur_cmd.count = block_size_mult *
                (cbw->command_block[7] << 8 |
                 cbw->command_block[8]);
+
+            queue_broadcast(SYS_USB_WRITE_DATA, (lun<<16)+cur_cmd.count);
             /* expect data */
             if((cur_cmd.sector + cur_cmd.count) > block_count) {
                 send_csw(UMS_STATUS_FAIL);