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diff --git a/examples/device_composite/src/msc_app.c b/examples/device_composite/src/msc_app.c
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+++ b/examples/device_composite/src/msc_app.c
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+/**************************************************************************/
+/*!
+ @file    msc_app.c
+ @author  hathach (tinyusb.org)
+
+ @section LICENSE
+
+ Software License Agreement (BSD License)
+
+ Copyright (c) 2013, hathach (tinyusb.org)
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. Neither the name of the copyright holders nor the
+ names of its contributors may be used to endorse or promote products
+ derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ This file is part of the tinyusb stack.
+ */
+/**************************************************************************/
+
+#include "msc_app.h"
+
+#if CFG_TUD_MSC
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+
+//--------------------------------------------------------------------+
+// tinyusb callbacks
+//--------------------------------------------------------------------+
+
+// Callback invoked when received an SCSI command not in built-in list below
+// - READ_CAPACITY10, READ_FORMAT_CAPACITY, INQUIRY, MODE_SENSE6, REQUEST_SENSE
+// - READ10 and WRITE10 has their own callbacks
+int32_t tud_msc_scsi_cb (uint8_t lun, uint8_t const scsi_cmd[16], void* buffer, uint16_t bufsize)
+{
+  // read10 & write10 has their own callback and MUST not be handled here
+
+  void const* response = NULL;
+  uint16_t resplen = 0;
+
+  // most scsi handled is input
+  bool in_xfer = true;
+
+  switch (scsi_cmd[0])
+  {
+    case SCSI_CMD_TEST_UNIT_READY:
+      // Command that host uses to check our readiness before sending other commands
+      resplen = 0;
+    break;
+
+    case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
+      // Host is about to read/write etc ... better not to disconnect disk
+      resplen = 0;
+    break;
+
+    case SCSI_CMD_START_STOP_UNIT:
+      // Host try to eject/safe remove/poweroff us. We could safely disconnect with disk storage, or go into lower power
+      /* scsi_start_stop_unit_t const * start_stop = (scsi_start_stop_unit_t const *) scsi_cmd;
+        // Start bit = 0 : low power mode, if load_eject = 1 : unmount disk storage as well
+        // Start bit = 1 : Ready mode, if load_eject = 1 : mount disk storage
+        start_stop->start;
+        start_stop->load_eject;
+       */
+       resplen = 0;
+    break;
+
+
+    default:
+      // Set Sense = Invalid Command Operation
+      tud_msc_set_sense(lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00);
+
+      // negative means error -> tinyusb could stall and/or response with failed status
+      resplen = -1;
+    break;
+  }
+
+  // return resplen must not larger than bufsize
+  if ( resplen > bufsize ) resplen = bufsize;
+
+  if ( response && (resplen > 0) )
+  {
+    if(in_xfer)
+    {
+      memcpy(buffer, response, resplen);
+    }else
+    {
+      // SCSI output
+    }
+  }
+
+  return resplen;
+}
+
+
+#endif