请问Read DEFECT DATA 37h 命令怎莫老不成功呢?

请问Read DEFECT DATA 37h 命令怎莫老不成功呢? 代码如下:
srbExecSCSICmd.SRB_Cmd        = SC_EXEC_SCSI_CMD;
srbExecSCSICmd.SRB_HaId       = HA;
srbExecSCSICmd.SRB_Target     = ID;
srbExecSCSICmd.SRB_Lun        = LN;
srbExecSCSICmd.SRB_Flags      = SRB_DIR_IN | SRB_EVENT_NOTIFY;
srbExecSCSICmd.SRB_BufLen     = 4;
srbExecSCSICmd.SRB_BufPointer = buf;
srbExecSCSICmd.SRB_SenseLen   = SENSE_LEN;
srbExecSCSICmd.SRB_CDBLen     = 10;
srbExecSCSICmd.CDBByte[0]     = READDEFECT;
srbExecSCSICmd.CDBByte[2]     = 0x0D; srbExecSCSICmd.CDBByte[8]     = 4;