HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 63

SCSI-2 Drive Command Set Inquiry Command (12H) Table 2-20 Inquiry Command (12H) This command sends controller and drive information to the initiator. Inquiry Command CDB Byte 0 1 2 3 4 5 7 6 5 4 3 2 1 0 Operation Code (12H) Logical Unit Number (0) Reserved (0) EVPD VPD Identifier Reserved (0) Allocation Length Reserved (0) Flag Link EVPD Page Code Allocation Length (8X and 14X only). An enable vital product data bit of 1 specifies that the drive shall return the optional vital product data specified by the page code field. An enable vital product data bit of 0 specifies that the drive shall return the standard INQUIRY data. The page code field specifies which page of vital product data information the drive shall return (Table 2-21). This field specifies the number of bytes that the initiator has allocated for the return data. An Allocation Length of 0 is not an error and indicates that no data will be returned. The initiator will terminate the data in phase when all available inquiry data has been returned or when allocation length bytes have been returned, whichever is less. If an inquiry command is received from an initiator with a pending UNIT ATTENTION (before the drive reports CHECK CONDITION status), the drive performs the INQUIRY command and does not clear the UNIT ATTENTION condition. 2-26 Chapter 2