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SCSI Commands

5-138 Quantum DLT 4000 Tape Drive

REQUEST SENSE Command (03h) (continued)

Table 5–66 REQUEST SENSE Data - Field Descriptions (continued)

Field Name Description

Command

Specific

Information

Bytes

Command Specific Information Bytes are handled as device-specific and can be

logged by the operating system on error conditions. On tape medium errors,

such an entry usually contains the current SCSI Logical Block Address.

Additional Sense

Code

This field (and the field for Additional Sense Code Qualifier) provide additional

information about the Sense Key and cause of a CHECK CONDITION status.

Additional Sense Codes are discussed in detail later in this chapter.

Additional Sense

Code Qualifier

This field (and the field for Additional Sense Code) provides additional

information about the Sense Key and cause of a CHECK CONDITION status.

Additional Sense Code Qualifiers are discussed in detail later in this chapter.

Sub-Assembly

Code

Not used. Returned as 0.

SKSV Sense-Key Specific Valid. When = 1, indicates that the Sense Key specific field is

as defined by the International Standard.

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

contained in the Command Descriptor Block. A C/D set to 0 indicates that the

illegal parameter is in the Parameter List from the initiator.

BPV Bit Pointer Valid. When set to 1, this field 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.

Field Pointer This field indicates which byte of the Command Descriptor Block or Parameter

List is in error. For a multi-byte field, the most significant byte is indicated.

Internal Status

Code

Internal Status Codes are explained in detail in Appendix A.

Tape Motion

Hours

This field reports the number of tape motion (i.e., head wear) hours. Format is

given as a hexadecimal word (2 bytes).

Power On Hours This field reports the total number of hours that drive power has been applied

since its last power on cycle (not total power on hours over the device’s

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

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

1 2 ... 233 234 235 236 237 238 239 240 241 242 243 ... 299 300

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