SCSI Commands: 24BPARK UNPARK Page 1133.12 PARK UNPARKThe PARK UNPARK command with the park bit set requests that the drive park theload arm in preparation for transport.The PARK UNPARK command with the park bit not set requests that the drive loadarm be unparked. This is not usually necessary as the drive automatically unparkson power up.In either case, attempting to issue this command while the medium is present willresult in a vendor specific check condition of MEDIUM_IS_PRESENT (09/80/80).The PARK UNPARK command is a vendor unique command.3.12.1 PARK UNPARK Command Descriptor BlockByteBits7 6 5 4 3 2 1 00 Operation Code (06h)1 Ignored LUN Reserved2 Reserved3 Reserved4 Reserved Park5 Control3.12.1.1 PARK UNPARK Command Field DescriptionsField Bytes Bits DescriptionOperationCode0 The Operation Code for PARK UNPARK is 06h.IgnoredLogicalUnit1 5-7 The LUN field is vestigial from the SCSI-1 standard and isignored.Park 4 0 0b = Requests the drive to be unparked.1b = Requests the drive to be parked.Reserved All reserved bits must be 0.Control 5 See SCSI Command Control Byte Format on page 25.3.12.2 PARK UNPARK Completion StatusCode Message Description00h Good Status • The drive is ready to perform any appropriate command.• The drive remains in any previously set mode.• The tape position is not changed.02h Check Condition Use the REQUEST SENSE command to retrieve status information.Possible Sense Keys are:Code Message Description04h Hardware Error Drive hardware failure.05h Illegal Request The Command Descriptor Block is invalid.06h Unit Attention The cartridge was changed, or the drivewas reset prior to this command.09h Medium Present Cannot park drive with medium present.
