Sense Key Specific Field - Seagate Ultra160 Product Manual

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[15] The ADDITIONAL SENSE BYTES field may contain command specific data, peripheral device specific
data, or vendor-specific data that further defines the nature of the CHECK CONDITION status.
[16] Bytes 18-n are not presently used.
8.38.1

Sense Key Specific field

The SENSE KEY SPECIFIC field as defined by this manual when the value of the Sense Key Specific Valid
(SKSV) bit is one. The SKSV bit and SENSE KEY SPECIFIC fields are optional. The definition of this field is
determined by the value of the SENSE KEY field. This field is reserved for sense keys not described below. An
SKSV value of zero indicates that this field is not as defined by this manual.
Table 220. Field pointer bytes
Bits
7
Bytes
15 SKSV [1]
16 (MSB)
17
[1] SKSV. If the sense key is ILLEGAL REQUEST and the SKSV bit is set to one, the SENSE KEY SPECIFIC
field (Table 219) shall be as defined as shown in this table. The FIELD POINTER field indicates which ille-
gal parameters in the command descriptor block or the data parameters are in error.
[2] A Command Data (C/D) bit of one indicates that the illegal parameter is in the command descriptor block.
A C/D bit of zero indicates that the illegal parameter is in the data parameters sent by the application client
in the Data Out Buffer.
[3] A Bit Pointer Valid (BPV) bit of zero indicates that the value in the Bit Pointer field [4] is not valid. A BPV bit
of one indicates that the BIT POINTER field specifies which bit of the byte designated by the FIELD
POINTER field is in error.
[4] When a multiple-bit field is in error, the BIT POINTER field shall point to the most-significant (left-most) bit
of the field.
[5] The FIELD POINTER field indicates which byte of the command descriptor block or of the parameter data
was in error. Bytes are numbered starting from zero, as shown in the tables describing the commands and
parameters.
When a multiple-byte field is in error, the field pointer shall point to the most significant (left-most) byte of
the field. If several consecutive bytes are reserved, each shall be treated as a single-byte field.
Note. Bytes identified as being in error are not necessarily the place that has to be changed to correct
the problem.
If the sense key is RECOVERED ERROR (1h), HARDWARE ERROR (4h), or MEDIUM ERROR (3h), and if the
SKSV bit is one, the SENSE KEY SPECIFIC field is defined as shown in Table 221. These fields identify the
actual number of retries used in attempting to recover from the error condition.
Table 221: Actual Retry Count Bytes
Bit 7
Byte
15 SKSV
16 (MSB)
17
[1] The ACTUAL RETRY COUNT field returns implementation specific information on the actual number of
retries used in attempting to recover an error or exception condition.
Not all drives implement reporting actual retry count in bytes 15, 16, and 17. See individual drive's Product
Manual, Volume 1.
6 5
C/D [2] Reserved
6 5
ACTUAL RETRY COUNT [1]
SCSI Interface Product Manual, Rev. B
4 3
BPV [3]
FIELD POINTER [5]
4 3
Reserved
2 1
BIT POINTER [4]
(LSB)
2 1
(LSB)
0
0