Load/Unload 1Bh - Sony AIT-SDX470 Product Specifications Manual

LOAD/UNLOAD
7.3.

LOAD/UNLOAD 1Bh

Bit 7
Byte
0
1
2
3
4
5
6
7
8
9
10
11
The LOAD/UNLOAD command requests that the Device enables or disables further media access operations.
This command may also be used to request a re-tension function. Prior to performing the load or unload operation,
the Device shall ensure that all buffered data, and filemarks have been transferred to the medium.
An Immed (immediate) bit of zero indicates the Device shall not return status until the operation has completed.
An Immed bit of one indicates that the Device shall return status as soon as all buffered commands have
completed execution and the CDB has been validated. If CHECK CONDITION status is returned when the Immed
bit is set to one, the operation shall not be performed.
A Re-Tension (Re-Ten) bit of one indicates that the medium on the Device shall be correctly tensioned.
EOT: An end-of-tape (EOT) bit of one and a Load bit of ZERO indicates that the medium shall be positioned at
end-of-medium for removal from the peripheral device. Prior to performing the unload operation, any buffered data
that is to be written shall be transferred to the medium. An EOT bit of ZERO and Load bit of ZERO indicates that
the medium shall be positioned at beginning-of-medium for removal etc. An EOT bit of one and a Load bit of one
shall cause the drive to return CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and
the additional sense code shall be set to ILLEGAL FIELD IN CDB.
If the Load bit is set to one, the medium shall be loaded and positioned to the beginning-of-partition zero. If the
Load bit is zero, the medium in the Device shall be positioned for removal at the extreme position along the
medium. Following successful completion of an unload operation, the Device shall return "Check Condition" status
with the Sense Key set to NOT READY for all subsequent medium-access commands until a new volume is
mounted or a load operation is successfully completed.
PREVENT MEDIA REMOVAL (with prevent bit set) command, the tape is retained in the drive. A subsequent
LOAD command will load and position the tape at BOP ZERO. If an UNLOAD were sent instead, the drive would
return NOT READY and the tape would remain within the drive. In this case, the drive requires a PREVENT
ALLOW MEDIA REMOVAL (with prevent bit clear) command before an UNLOAD will eject the tape.
Note: While the PREVENT MEDIA REMOVAL is in effect, the Front Panel EJECT button is completely disabled.
If the cassette is unloaded but has not been ejected from the drive because of moisture detection, then a
subsequent UNLOAD will cause the tape to ejected from the drive. All commands except INQUIRY, REQUEST
SENSE and READ BLOCK LIMITS will return a CHECK CONDITION status with a HARDWARE ERROR sense
key set. The tape may also be ejected via the Front Panel EJECT button. If no cassette is in drive, both LOAD and
UNLOAD will return a CHECK CONDITION status with
NOT READY sense key set
SONY AIT-1 Turbo drive SDX-470V series Ver.1.0
6 5 4
Operation Code (1Bh)
Reserved
Reserved
7. ATAPI Packet Command Specification
3 2
Reserved
Reserved
EOT
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1 0
Immed
Re-Ten Load
7-7