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RESERVE UNIT
7.18. RESERVE UNIT 16h
Bit
7
Byte
0
1
2
3
4
5
6
7
8
9
10
11
RESERVE UNIT reserves the drive for exclusive use by the host.
The reservation will remain in effect until one of the following conditions is met:
- The host that made the reservation sends another RESERVE UNIT command.
- The drive is released by a RELEASE UNIT command from the same host.
- A BUS DEVICE RESET message is received from any host.
- A hard RESET condition occurs.
The occurrence of the last two conditions is indicated by the drive returning a CHECK CONDITION status with a
sense key of UNIT ATTENTION on the next command following the condition. It is not an error for a host to issue
RESERVE UNIT to the drive if the drive is currently reserved by that host.
3rdPty: The Third-Party Reservation option allows host to reserve the drive for another device. This option is
intended for systems that use the COPY command and is implemented by the drive. If the Third-Party bit is ZERO,
then the Third-Party Reservation option is not requested. If the 3rdPty bit is one, a
RESERVE UNIT reserves the drive for the device specified in the Third-Party Device ID field. The drive
preserves the reservation until any one of the four conditions mentioned above occurs.
A host that holds a current reservation may modify that reservation e.g., switch third-parties by issuing another
RESERVE UNIT command to the drive.
This command is implemented for Microsoft logo certification (WHQL).
SONY AIT-2 Turbo drive SDX-560V series Ver.1.0
6
5
Operation Code (16h)
Reserved
3rdPty
7. ATAPI Packet Command Specification
4
3
2
Third Party Device ID
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1
0
Reserved
7-59
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