SCSI Description

 

Table 3–1 Implemented ANSI SCSI-2 Command (continued)

 

 

 

 

 

 

 

Command

Code

Class

Description

 

 

 

 

 

 

 

MODE SELECT (6)

15h

Optional

Provides a means for the initiator to

 

 

 

 

specify device parameters.

 

MODE SENSE (6)/(10)

1Ah/

Optional

Provides a means for a drive to report

 

 

5Ah

 

parameters to the initiator.

 

PREVENT ALLOW

1Eh

Optional

Requests that the target enable or

 

MEDIUM REMOVAL

 

 

disable the removal of the medium in

 

 

 

 

the logical unit. Medium cannot be

 

 

 

 

removed if any initiator has medium

 

 

 

 

removal prevented.

 

READ

08h

Mandatory

Requests the drive to transfer data to the

 

 

 

 

initiator.

 

READ BLOCK LIMITS

05h

Mandatory

Requests that the logical unit’s block

 

 

 

 

length limits capability be returned.

 

READ BUFFER

3Ch

Optional

Used in conjunction with the WRITE

 

 

 

 

BUFFER command as a diagnostic

 

 

 

 

function for testing target memory and

 

 

 

 

the integrity of the SCSI bus. This

 

 

 

 

command does not alter the medium.

 

READ POSITION

34 h

Optional

Reports the current position of the

 

 

 

 

logical unit and any data blocks in the

 

 

 

 

buffer.

 

RECEIVE DIAG

1Ch

Optional

Requests analysis data to be sent to the

 

RESULTS

 

 

initiator after completion of a SEND

 

 

 

 

DIAGNOSTIC Command.

 

RELEASE UNIT

17h

Mandatory

Used to release a previously reserved

 

 

 

 

logical unit.

 

REQUEST SENSE

03h

Mandatory

Requests the drive to transfer sense data

 

 

 

 

to the initiator.

 

RESERVE UNIT

16h

Mandatory

Used to reserve a logical unit.

 

SEND DIAGNOSTIC

1Dh

Mandatory

Requests the drive to perform diagnostic

 

 

 

 

operations on itself.

 

 

 

 

 

 

Quantum DLT 7000 Tape System

3-3

Page 67
Image 67
Quantum Instruments DLT 7000 manual Implemented Ansi SCSI-2 Command

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