HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 47

Table 2-6 SCSI-2 Drive Command Set Request Sense Command (03H) Request Sense Command (03H) This command determines the specific error condition when a drive fails to complete a command and returns a CHECK CONDITION status. Sense data is preserved for the initiator until retrieved by a Request Sense Command or until the same drive receives another command. Internal Error Codes are used to represent the error condition and can be used to determine what type of error recovery procedure is appropriate. Request Sense Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (03H) 1 Logical Unit Number (0) Reserved (0) 2 Reserved (0) 3 Reserved (0) 4 Allocation Length (Table 2-7 on page 2-11) 5 Reserved (0) Flag Link The Allocation Length indicates the number of bytes of sense data that the drive transfers to the initiator. This drive has 22 bytes of sense data. If an allocation length specified is less, then the allocated amount is transferred, the remaining sense data is lost, and no error will be reported. If an allocated length specified is greater, then only 22 bytes of sense data are transferred and no error will be reported. 2-10 Chapter 2