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LOAD/UNLOAD

Table 12. LOAD/UNLOAD Command

76543210

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.

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

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IBM T200F User Manual Page 28