Load/Unload; Load/Unload Command - IBM Ultrium Internal Tape Drive T200 Reference Manual

LOAD/UNLOAD

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Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference
Table 12. LOAD/UNLOAD Command
7 6
0
1 Logical Unit Number (0)
2
3
4
5
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.
5 4 3
Operation Code (1Bh)
Reserved
Reserved
Reserved
Control
2 1
Reserved
EOT(0) Reten(0)
0
Immed
Load