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101

SCSI-2 Drive Command Set

Start/Stop Unit Command (1BH)

Chapter 2 2-73

SCSI-2 Drive Commands

Start/Stop Unit Command (1BH)

This command starts or stops rotation of the optical disk in the drive

and/or ejects the optical disk from the drive.

Immed An Immediate bit of 1 indicates that status is returned

as soon as the command descriptor block has been

validated.

An Immed bit of 0 indicates that status is returned after

the operation is completed.

LoEj A Load Eject bit of 0 requests that no action be taken

regarding loading or ejecting the media.

A Load Eject bit of 1 indicates that the media will be

unloaded if the Start bit is 0.

A Load Eject bit of 1 indicates that the media will be

loaded if the Start bit is 1.

NOTE This command is affected by the Prevent/Allow Medium Removal

command. Do not use LoEj in an autochanger environment.

Start A Start bit of 1 indicates that the drive starts rotating

the optical disk. A Start bit of 0 indicates that the drive

stops rotating the optical disk.

Table 2-62 Start/Stop Unit Command CDB

Byte 7 6 5 4 3 2 1 0

0 Operation Code (1BH)

1 Logical Unit Number

(0)

Reserved (0) Immed

2 Reserved (0)

3 Reserved (0)

4 Reserved (0) LoEj Start

5 Reserved (0) Flag Link

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 377 378

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