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Quantum DLT 7000 Tape System 5-29
LOAD UNLOAD Command (1Bh) (continued)
Table 5–14 LOAD UNLOAD Command Descriptor Block - Field Descriptions
Field Name Description
Immed Immediate. If this bit is set to 1, status is returned as soon as the operation is
started. If set to 0, status is returned after the operation has completed.
Re-Ten Re-tension. Re-tension operations are not needed on the tape drive. This bit is
ignored (i.e., “good” status, if bit is set to 1).
Load Load. When a cartridge is inserted, the tape medium is automatically loaded and
positioned by the drive at Beginning of Medium (BOM). Logically, the drive is
positioned at the beginning of Partition 0.
If the Load bit is set to 1, and the medium is already loaded, no action is taken. A
“good” status is returned. If the medium was unloaded but the cartridge was
not removed, a Load command causes the tape to be loaded to Beginning of
Partition (BOP) again and made ready.
If the Load bit is set to 0, and the medium is loaded, the drive writes any
buffered data and filemarks to the tape and then rewinds the tape to BOM and
unloads the medium back into the cartridge. The green Operate Handle
indicator on the tape drive’s faceplate illuminates and the cartridge can be
removed from the tape drive. If the medium is already unloaded, no action is
taken. A “good” status is returned.
EOT End of Tape. This bit is ignored by the tape drive unless both the EOT and Load
bits are set to 1, then the drive returns CHECK CONDITION, ILLEGAL REQUEST
data.