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Sense Data and Error Recovery Methods
362 C141-C013
(6) Additional sense data length
This field indicates the length (number of bytes) after byte 8 of the sense data.
The value shown in this field shows the length of sense data provided by the HDD
without relation to the value specified in the "Transfer byte length" in the CDB of
the REQUEST SENSE command. The length of the HDD's sense data is fixed at
48 bytes and this field always indicates X '28' (40 bytes).
(7) Command inherent information
This field indicates information that is inherent to the command where the error
occurred. The only command for which the value in this field is valid in the HDD
is the REASSIGN BLOCKS command. See the description of the REASSIGN
BLOCKS command (Section 4.3.2) concerning details of the information shown
in this field.
(8) Additional Sense code, Additional Sense code Qualifier
The codes which indicate the reason for the error displayed by the sense key in
detail are reported in these fields. The INIT can decide procedures for error
recovery according to the sense key and these fields. The sense code and sub-
sense code are defined in Table 6.4.
(9) SKSV (sense key specific valid) , sense key inherent information
When the sense key indicates one of "RECOVERED ERROR [=1]," "MEDIUM
ERROR [=3]" or "HARDWARE ERROR [=4]," and the "SKSV" bit indicates "1,"
indicates the number of times the HDD has attempted to recover from the detected
error as shown in Table 6.2 (a).
When the sense key indicates "NOT READY [=2]" and the "SKSV" bit indicates
"1", indicates the progressing rate of the formatting operation by the FORMAT
UNIT command with [n/65536] as shown in Table 6.2 (b), or the progressing rate
of the drive self-test operation by the SEND DIAGNOSTICS Command (Self-
Test = 0)