SCSI Commands

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.

 

 

Quantum DLT 7000 Tape System

5-29

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Quantum Instruments DLT 7000 manual Load Unload Command Descriptor Block Field Descriptions, Eot
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