Sense Data and Error Recovery Methods5-4 C141-C009(6) Additional sense data lengthThis 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 IDDwithout relation to the value specified in the “Transfer byte length” in the CDB ofthe REQUEST SENSE command. The length of the IDD’s sense data is fixed at48 bytes and this field always indicates X ‘28’ (40 bytes).(7) Command inherent informationThis field indicates information that is inherent to the command where the erroroccurred. The only command for which the value in this field is valid in the IDDis the REASSIGN BLOCKS command. See the description of the REASSIGNBLOCKS command (Section 4.3.2) concerning details of the information shownin this field.(8) Additional Sense code, Additional Sense code QualifierThe codes which indicate the reason for the error displayed by the sense key indetail are reported in these fields. The INIT can decide procedures for errorrecovery according to the sense key and these fields. The sense code and sub-sense code are defined in Table 5.4.(9) SKSV (sense key specific valid) , sense key inherent informationWhen the sense key indicates one of “RECOVERED ERROR [=1],” “MEDIUMERROR [=3]” or “HARDWARE ERROR [=4],” and the “SKSV” bit indicates “1,”indicates the number of times the IDD has attempted to recover from the detectederror as shown in Table 5.2 (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 FORMATUNIT command with [n/65536] as shown in Table 5.2 (b), or the progressing rateof the drive self-test operation by the SEND DIAGNOSTICS Command (Self-Test = 0)
