diff --git a/libraries/UsbHostMsd/UsbHostMsd.cpp b/libraries/UsbHostMsd/UsbHostMsd.cpp
index 6796b66ac..fec5895d4 100644
--- a/libraries/UsbHostMsd/UsbHostMsd.cpp
+++ b/libraries/UsbHostMsd/UsbHostMsd.cpp
@@ -26,7 +26,7 @@ extern "C" uint8_t usb_host_msd_get_lun_num();
 extern "C" uint32_t usb_host_msd_get_num_of_blocks(uint8_t lun);
 extern "C" uint32_t usb_host_msd_get_block_size(uint8_t lun);
 extern "C" void usb_host_msd_attach_mnt_cbk(void (*fnc)(void));
-
+extern "C" void usb_host_msd_attach_umnt_cbk(void (*fnc)(void));
 
 /* -------------------------------------------------------------------------- */
 /*                               CONSTRUCTOR                                  */
@@ -224,4 +224,11 @@ const char *USBHostMSD::get_type() const {
 
 bool USBHostMSD::attach_detected_callback(void (*cbk)()) {
     usb_host_msd_attach_mnt_cbk(cbk);
+    return true;
+}
+
+bool USBHostMSD::attach_removed_callback(void (*cbk)()) {
+    usb_host_msd_attach_umnt_cbk(cbk);
+    return true;
 }
+
diff --git a/libraries/UsbHostMsd/UsbHostMsd.h b/libraries/UsbHostMsd/UsbHostMsd.h
index 4360d4451..8bba0b35b 100644
--- a/libraries/UsbHostMsd/UsbHostMsd.h
+++ b/libraries/UsbHostMsd/UsbHostMsd.h
@@ -47,6 +47,7 @@ class USBHostMSD : public BlockDevice {
     virtual bool select_lun(uint8_t lun);
     virtual uint8_t get_lun_num();
     bool attach_detected_callback(void (*cbk)());
+    bool attach_removed_callback(void (*cbk)());
     
 private:
     uint8_t get_lun();
diff --git a/libraries/UsbHostMsd/tu_msc.c b/libraries/UsbHostMsd/tu_msc.c
index 22520770a..99f14d0b1 100644
--- a/libraries/UsbHostMsd/tu_msc.c
+++ b/libraries/UsbHostMsd/tu_msc.c
@@ -68,11 +68,16 @@ uint32_t usb_host_msd_get_block_size(uint8_t lun) {
 }
 
 static void (*mount_fnc)(void) = NULL;
+static void (*unmount_fnc)(void) = NULL;
 
 void usb_host_msd_attach_mnt_cbk(void (*fnc)(void)) {
   mount_fnc = fnc;
 }
 
+void usb_host_msd_attach_umnt_cbk(void (*fnc)(void)) {
+  unmount_fnc = fnc;
+}
+
 //--------------------------------------------------------------------+
 // MACRO TYPEDEF CONSTANT ENUM DECLARATION
 //--------------------------------------------------------------------+
@@ -167,6 +172,10 @@ void tuh_msc_umount_cb(uint8_t dev_addr) {
 
   device_address = -1;
 
+  if (unmount_fnc != NULL) {
+    unmount_fnc();
+  }
+
 //  uint8_t phy_disk = dev_addr-1;
 //
 //  f_mount(phy_disk, NULL); // unmount disk