LOAD/UNLOAD

Table 12. LOAD/UNLOAD Command

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

6

5

 

4

 

3

 

2

1

0

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

Operation Code (1Bh)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Logical Unit Number (0)

 

 

 

Reserved

 

Immed

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

Reserved

 

 

 

 

 

EOT(0)

Reten(0)

Load

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If the Load flag is set and there is a tape in the drive, it is positioned to BOM. If the

 

Load flag is set and there is no tape in the drive, Check Condition status is

 

returned. The Sense Key is set to Not Ready (2) and the ASC/ASCQ is set to

 

Parameter Medium Not Present (3A00).

 

If the Load flag is clear, there is a tape in the drive, and medium removal prevention

 

has not been set, then the tape is unloaded and ejected. If the Load flag is clear,

 

there is a tape in the drive, and medium removal prevention has been set, then

 

Check Condition status is returned. The Sense Key is set to Illegal Request (5) and

 

the ASC/ASCQ is set to Medium Removal Prevented (5302).

If the Load flag is clear and the tape is in the ejected position, the command is

presented with Check Condition status and associated sense data of 2/0402 (Not

Ready, Initialization Required). If the Load flag is clear and there is no cartridge

present, the command is presented with Check Condition status and associated

data of 2/3A00 (Not Ready, Medium Not Present).

 

If the Immediate (Immed) flag is set to 1, then the drive validates the command and

 

waits for any previous command from any server to complete, including any

 

immediate commands that are currently being processed. It also waits for any

 

buffered data to be flushed to tape. It then reports a deferred error for any

 

preceding command or buffered data, if appropriate. If there is no deferred error,

 

the drive reports Good status and initiates the command. If the Immediate (Immed)

 

flag is set to 0, status is not returned until after the command has completed.

 

The End Of Tape (EOT) and Retension (Reten) flags are not supported and should

 

be set to 0.

14Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference

Page 28
Image 28
IBM T200F manual Load/Unload, LOAD/UNLOAD Command

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