SCSI Commands

5.11PREVENT / ALLOW MEDIUM REMOVAL COMMAND (1Eh)

This command enables or disables the unloading of the tape cartridge.

Bit

7

 

6

 

5

4

 

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

 

 

Quantum DLT 7000 Tape System

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Image 231
Quantum Instruments DLT 7000 manual Prevent / Allow Medium Removal Command 1Eh

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