Prevent Allow Medium Removal 1Eh - Sony DDS-4 Product Description Manual

6. COMMAND SPECIFICATION

6. 09 PREVENT ALLOW MEDIUM REMOVAL 1Eh

Bit 7
Byte
0
1
2
3
4
5 Unused (00b)
The PREVENT ALLOW MEDIUM REMOVAL command requests that the target enable or disable the removal of the
medium in the drive. This mechanism is independent of device reservations and the drive shall not allow medium
removal if any initiator currently has medium removal prevented.
The prevention of medium removal shall begin when any initiator issues a PREVENT ALLOW MEDIUM REMOVAL
command with a prevent bit of one (medium removal prevented). The prevention of medium removal for the logical
unit shall terminate:
1. Upon a hard RESET condition.
2. Upon the receipt of a BUS DEVICE RESET message from any initiator
3. After all initiators that have medium removal prevented issue PREVENT
ALLOW MEDIUM REMOVAL commands with a prevent bit of zero, and the target has successfully
performed a synchronize cache operation.
While a prevention of medium removal condition is in effect the target shall inhibit mechanisms that normally allow
removal of the medium by an operator.
Prevent:
When this bit is set, the drive will not eject the tape following an UNLOAD. When it receives the UNLOAD, the
drive writes any buffered data to tape, rewinds and updates the system logs, then unthreads the tape from the
mechanism. The drive does not eject the tape. Setting this bit also completely disables the Eject button on the front
panel. This situation remains until the Prevent bit is set to zero.
When this bit is set to zero, the drive ejects the cassette following completion of an UNLOAD. The Eject button is
also re-enabled.
6 - 54 SONY SDT-10000/SDT-11000 DDS Tape Drive
6 5
Logical Unit Number
PREVENT ALLOW MEDIUM REMOVAL
4 3
Operation Code (1Eh)
Reserved
Reserved
Reserved
Reserved
Reserved
2 1 0
Prevent