4-10AEC-4412B/7412B User’s GuideAEC-4412B/7412B User’s GuideStock Number: 511640-00 Rev B Page: 4-10Print Spec Number: 497358-00Current Date: 3/19/98 ECN Date: 3/20/98The AEC-4412B/7412B will return the LBA and size in bytes of thelast LBA on the logical device referenced by the specified LUN. TheReladr bit, PMI bit, and LBA must be zero. The block size is always200h. Data is returned in the format shown in Table 4-9.ReleaseThis command allows the host to release a previously reserved logi-cal unit.Request SenseThe AEC-4412B/7412B will maintain separate sense data (includingsense key, additional sense code and additional sense code qualifier)for each initiator. This data is updated whenever a check condition isreturned to the initiator. It will be cleared whenever a commandcompletes successfully to that initiator. Table 4-11 describes theRequest Sense command.Table 4-9. Return Data FormatByte# Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit00 (MSB) Returned Logical3 Block Address (LSB)4 (MSB) Block Length7 In Bytes (LSB)Table 4-10. Release CommandByte# Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit00 17h1 LUN 3rd pty 3rd party device ID extent2 Reservation Identification3 Reserved4 Reserved5 Reserved
