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Additional Sense
Length
This field specifies the number of additional sense bytes to follow. If
the Allocation Length of the Command Descriptor Block is too small
to transfer all of the Additional Sense bytes, the Additional Sense
Length is not adjusted to reflect the truncation.
Command Specific
Information Bytes
Command Specific Information Bytes 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) provide
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.
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