Request Sense
96122 • Revision: F Chapter 6 SCSI Commands 211
Request Sense Data Definitions:
Val id This bit indicates if the Information field contains valid data.
The library does not return data in the Information field. The value is 0.
Error Code This bit indicates if the error is current or deferred.
The library returns only current errors. The value is 70h.
Segment Number The library does not support segment numbers and returns a value of 00h.
Sense Key The Sense Key (SK) field, with the Additional Sense Code and Additional Sense
Code Qualifier fields, describes the error.
Information The library does not support this field and returns a value of 00h.
Additional Sense Length This field indicates the Additional Sense Length provided by the library
excluding this byte.
The typical value is 0Ch (12d).
Command Specific
Information
The library does not support this field and returns a value of 00h.
Additional Sense Code The Additional Sense Code (ASC) field, with the Sense Key and Additional
Sense Code Qualifier fields, describes the error.
Additional Sense Code
Qualifier
The Additional Sense Code Qualifier (ASCQ) field, with the Sense Key and
Additional Sense Code fields, describes the error.
Field Replaceable Unit
Code
The library does not support this field and returns a value of 00h.
SKSV (Sense Key
Specific Valid)
When the Sense Key Specific Valid bit is set to 1, the fields C/D and Field
pointer are valid.
Otherwise, ignore these fields.
C/D (Command/Data) Command/Data indicates whether the Check Condition status resulted from an
illegal parameter in either the command descriptor block (Command) or the
parameter list (Data)
■ 0 = Illegal parameter in the parameter list.
■ 1 = Illegal parameter in the command descriptor block.
BPV (Bit Pointer Valid) The library does not support the Bit Pointer Valid (BPV) field and returns a
value of 0.
Bit Pointer The library does not support this field and returns a value of 0h.
Field Pointer This field contains the number of the byte where the error occurred.
Byte numbers start at 00.
When a multiple-byte field is in error, the Field Pointer contains the value of the
most significant byte of the field, which is the byte with the lowest byte number.
For example, if a field consists of bytes 02, 03, and 04,
the most significant byte is 02.
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