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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-219

Field

Replaceable

Unit Code

Not used. Always set to 0.

SKSV Sense-Key Specific Valid. When set to 1, indicates that the data in the

Sense-Key Specific fields is valid.

C/D Command / Data. When set to 1, indicates that the illegal parameter is

contained in the CDB. When set to 0, indicates that the illegal parameter is

in the Parameter List from the initiator.

BPV Bit Pointer Valid. When set to 1, indicates that the Bit Pointer field is valid

and designates which bit of the byte designated by the field pointer is in

error. For a multi-bit field, it points to the most significant bit of the field.

Bit Pointer When BPV is set to 1, indicates the most significant bit of the field in error.

Reserved fields are treated as individual bit fields—the most significant

reserved bit that is set is indicated rather than the most significant bit of the

entire reserved field. When the field in error uses an entire byte, the Bit

Pointer field is typically not used (BPV is set to 0).

Field Pointer If the Sense Key is ILLEGAL REQUEST, this field indicates which byte of

the CDB or Parameter List is in error. For a multi-byte field, the most

significant byte is indicated.

If the Sense Key is NO SENSE and the Additional Sense Code field is

OPERATION IN PROGRESS, this field indicates the progress toward

completion as the numerator of a fraction with 65,536 as the denominator.

Internal Status

Code

Vendor specific.

Tape Motion

Hours

Reports the number of tape motion (head wear) hours. Format is given as a

hexadecimal word (2 bytes).

Power On Hours Reports the total number of hours that drive power has been applied over the

drive’s lifetime. Format is given as a hexadecimal longword (4 bytes).

Tape Remaining Reports the amount of tape remaining in 4 KB (4096 bytes) blocks.

Table 4-129. REQUEST SENSE Data — Field Descriptions (Continued)

Field Name Description

1 2 ... 256 257 258 259 260 261 262 263 264 265 266 ... 293 294

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Quantum 1200 Series DAT Autochanger Uživatelská příručka Strana 261