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100

101

SCSI Commands

Quantum DLT 8000 Tape System 5-159

5.13 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 5–70 PREVENT / ALLOW MEDIUM REMOVAL Command Descriptor Block — Data

Format

Table 5–71 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.

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