diff --git a/examples/device/cdc_msc_hid/src/msc_disk.c b/examples/device/cdc_msc_hid/src/msc_disk.c
index ff74ff46..be99a239 100644
--- a/examples/device/cdc_msc_hid/src/msc_disk.c
+++ b/examples/device/cdc_msc_hid/src/msc_disk.c
@@ -155,7 +155,7 @@ void tud_msc_capacity_cb(uint8_t lun, uint32_t* block_count, uint16_t* block_siz
 // Invoked when received Start Stop Unit command
 // - Start = 0 : stopped power mode, if load_eject = 1 : unload disk storage
 // - Start = 1 : active mode, if load_eject = 1 : load disk storage
-void tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject)
+bool tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject)
 {
   (void) lun;
   (void) power_condition;
@@ -170,6 +170,8 @@ void tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, boo
       // unload disk storage
     }
   }
+
+  return true;
 }
 
 // Callback invoked when received READ10 command.
diff --git a/examples/device/cdc_msc_hid_freertos/src/msc_disk.c b/examples/device/cdc_msc_hid_freertos/src/msc_disk.c
index 36c99774..6962e09e 100644
--- a/examples/device/cdc_msc_hid_freertos/src/msc_disk.c
+++ b/examples/device/cdc_msc_hid_freertos/src/msc_disk.c
@@ -155,7 +155,7 @@ void tud_msc_capacity_cb(uint8_t lun, uint32_t* block_count, uint16_t* block_siz
 // Invoked when received Start Stop Unit command
 // - Start = 0 : stopped power mode, if load_eject = 1 : unload disk storage
 // - Start = 1 : active mode, if load_eject = 1 : load disk storage
-void tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject)
+bool tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject)
 {
   (void) lun;
   (void) power_condition;
@@ -170,6 +170,8 @@ void tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, boo
       // unload disk storage
     }
   }
+
+  return true;
 }
 
 // Callback invoked when received READ10 command.
diff --git a/examples/device/msc_dual_lun/src/msc_disk_dual.c b/examples/device/msc_dual_lun/src/msc_disk_dual.c
index 718e0d6e..d44d1828 100644
--- a/examples/device/msc_dual_lun/src/msc_disk_dual.c
+++ b/examples/device/msc_dual_lun/src/msc_disk_dual.c
@@ -247,7 +247,7 @@ void tud_msc_capacity_cb(uint8_t lun, uint32_t* block_count, uint16_t* block_siz
 // Invoked when received Start Stop Unit command
 // - Start = 0 : stopped power mode, if load_eject = 1 : unload disk storage
 // - Start = 1 : active mode, if load_eject = 1 : load disk storage
-void tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject)
+bool tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject)
 {
   (void) lun;
   (void) power_condition;
@@ -262,6 +262,8 @@ void tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, boo
       // unload disk storage
     }
   }
+
+  return true;
 }
 
 // Callback invoked when received READ10 command.
diff --git a/src/class/msc/msc_device.c b/src/class/msc/msc_device.c
index 5681e4f0..1e651459 100644
--- a/src/class/msc/msc_device.c
+++ b/src/class/msc/msc_device.c
@@ -200,7 +200,7 @@ int32_t proc_builtin_scsi(uint8_t lun, uint8_t const scsi_cmd[16], uint8_t* buff
       resplen = 0;
       if ( !tud_msc_test_unit_ready_cb(lun) )
       {
-        // not ready response with Failed status and sense key = not ready
+        // Failed status response
         resplen = - 1;
 
         // If sense key is not set by callback, default to Logical Unit Not Ready, Cause Not Reportable
@@ -214,7 +214,14 @@ int32_t proc_builtin_scsi(uint8_t lun, uint8_t const scsi_cmd[16], uint8_t* buff
       if (tud_msc_start_stop_cb)
       {
         scsi_start_stop_unit_t const * start_stop = (scsi_start_stop_unit_t const *) scsi_cmd;
-        tud_msc_start_stop_cb(lun, start_stop->power_condition, start_stop->start, start_stop->load_eject);
+        if ( !tud_msc_start_stop_cb(lun, start_stop->power_condition, start_stop->start, start_stop->load_eject) )
+        {
+          // Failed status response
+          resplen = - 1;
+
+          // If sense key is not set by callback, default to Logical Unit Not Ready, Cause Not Reportable
+          if ( _mscd_itf.sense_key == 0 ) tud_msc_set_sense(lun, SCSI_SENSE_NOT_READY, 0x04, 0x00);
+        }
       }
     break;
 
@@ -417,7 +424,7 @@ bool mscd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t event, uint32_t
             // failed but senskey is not set: default to Illegal Request
             if ( p_msc->sense_key == 0 ) tud_msc_set_sense(p_cbw->lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00);
 
-            /// Stall bulk In if needed
+            // Stall bulk In if needed
             if (p_cbw->total_bytes) usbd_edpt_stall(rhport, p_msc->ep_in);
           }
           else
diff --git a/src/class/msc/msc_device.h b/src/class/msc/msc_device.h
index 03a4afad..c07008c5 100644
--- a/src/class/msc/msc_device.h
+++ b/src/class/msc/msc_device.h
@@ -131,7 +131,7 @@ TU_ATTR_WEAK uint8_t tud_msc_get_maxlun_cb(void);
 // Invoked when received Start Stop Unit command
 // - Start = 0 : stopped power mode, if load_eject = 1 : unload disk storage
 // - Start = 1 : active mode, if load_eject = 1 : load disk storage
-TU_ATTR_WEAK void tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject);
+TU_ATTR_WEAK bool tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject);
 
 // Invoked when Read10 command is complete
 TU_ATTR_WEAK void tud_msc_read10_complete_cb(uint8_t lun);