Index: C:/ROS/reactos/drivers/usb/usbstor/scsi.c
===================================================================
--- C:/ROS/reactos/drivers/usb/usbstor/scsi.c	(revision 57149)
+++ C:/ROS/reactos/drivers/usb/usbstor/scsi.c	(working copy)
@@ -1249,7 +1249,43 @@
     return USBSTOR_SendRequest(DeviceObject, Irp, UFI_TEST_UNIT_CMD_LEN, (PUCHAR)&Cmd, 0, NULL, RetryCount);
 }
 
+NTSTATUS
+USBSTOR_SendUnknownRequest(
+    IN PDEVICE_OBJECT DeviceObject,
+    IN OUT PIRP Irp,
+    IN ULONG RetryCount)
+{
+    PPDO_DEVICE_EXTENSION PDODeviceExtension;
+    PIO_STACK_LOCATION IoStack;
+    PSCSI_REQUEST_BLOCK Request;
 
+    //
+    // get current stack location
+    //
+    IoStack = IoGetCurrentIrpStackLocation(Irp);
+
+    //
+    // get request block
+    //
+    Request = IoStack->Parameters.Others.Argument1;
+
+    //
+    // get PDO device extension
+    //
+    PDODeviceExtension = (PPDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
+
+    //
+    // check that we're sending to the right LUN
+    //
+    ASSERT(Request->Cdb[1] == (PDODeviceExtension->LUN & MAX_LUN));
+
+    //
+    // send the request
+    //
+    return USBSTOR_SendRequest(DeviceObject, Irp, 12, Request->Cdb, Request->DataTransferLength, Request->DataBuffer, RetryCount);
+}
+
+
 NTSTATUS
 USBSTOR_HandleExecuteSCSI(
     IN PDEVICE_OBJECT DeviceObject,
@@ -1366,6 +1402,15 @@
         //
         Status = USBSTOR_SendTestUnit(DeviceObject, Irp, RetryCount);
     }
+    else if (pCDB->AsByte[0] == SCSIOP_MECHANISM_STATUS)
+    {
+        DPRINT1("SCSIOP_MECHANISM_STATUS\n");
+
+        //
+        // Just send it the way it is
+        //
+        Status = USBSTOR_SendUnknownRequest(DeviceObject, Irp, RetryCount);
+    }
     else
     {
         DPRINT1("UNIMPLEMENTED Operation Code %x\n", pCDB->AsByte[0]);