Preface

Message Out-Phase (issued by host computer)

 

INITIATED DEFECTED ERROR

05h

ABORT

06h

NO OPERATION

08h

MESSAGE PARITY ERROR

09h

BUS DEVICE DRIVER3

0Ch

TERMINATE IO PROCESS

11h

IDENTIFY

80h - FFh

SYNCHRONOUS DATA TRANSFER REQUEST4

01h

1.4Address Format for Answering Occasion (MSF bit)

With some commands, it is possible to choose either Logical Block Address or MSF Format with Address Field of answering data.

MSF bit

if “0” (FALSE), use Logical Block Address as CD-ROM Absolute Address or Track Relative Address. If Track Relative Address, the MSF bit is indicated by 2s sequences.

if “1” (TRUE), MSF Format is used. Within the shift area, number declines by a positive number.

1.5Sample Command

The table on the opposite page outlines the command structure. Some commands apply to the entire drive. For these commands only, the LUN will be ignored.

Commands with Logical Blocks, e.g. READ, VERIFY, have Allocation Length in Blocks. All others have Allocation Length in bytes. Some commands use Transfer Length instead of Allocation Length to specify the number of bytes that the initiator will transfer to the drive.

3For equipment supporting Change Definition Command, the DRM/DR-U Series drives have a Hardware Reset Option. In this case, the Change Definition chosen by the SCSI action definition would not be changed or initialized by either the SCSI BUS RESET or BUS DEVICE RESET message.

4From EXTEND MESSAGE (01h).

- 7 -