Quantum DLT 4000 Manual descarregar pdf (Página 129)

SCSI Commands

Quantum DLT 4000 Tape Drive 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. 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.

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.

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Quantum DLT 4000 Manual Página 129