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SCSI Commands
Quantum DLT 7000 Tape System 5-127
5.11 PREVENT / ALLOW MEDIUM REMOVAL COMMAND (1Eh)
This command enables or disables the unloading of the tape cartridge.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (1Eh)
1 Logical Unit Number Reserved
2 - 3 Reserved
4 Reserved Prevent
5 Unused Reserved Flag Link
Figure 5–60 PREVENT / ALLOW MEDIUM REMOVAL Command Descriptor Block -
Data Format
Table 5–60 PREVENT / ALLOW MEDIUM REMOVAL Command Descriptor Block -
Field Descriptions
Field Name Description
Prevent When set to 1, the UNLOAD button on the drive’s front panel is effectively
disabled, and the UNLOAD command does not unload the tape medium or the
cartridge. The PREVENT / ALLOW status in the device is maintained separately by
each initiator.
When set to 0, the prevent state corresponding to that initiator is cleared. When all
initiators have cleared their prevent states, the UNLOAD button and UNLOAD
commands are enabled. By default, after power up, a hard reset, or Bus Device
Reset message, the prevent medium removal function is cleared.
If a Media Loader device is present, its MOVE MEDIUM command is prevented
from removing a cartridge if PREVENT has been enabled.