/** SCSI Command Code for a READ CAPACITY (10) command. */
                #define SCSI_CMD_READ_CAPACITY_10                      0x25
 
+               /** SCSI Command Code for a START STOP UNIT command. */
+               #define SCSI_CMD_START_STOP_UNIT                       0x1B
+
                /** SCSI Command Code for a SEND DIAGNOSTIC command. */
                #define SCSI_CMD_SEND_DIAGNOSTIC                       0x1D