Prevent/Allow Medium Removal; Command Description; Command Descriptor Block; Table 16-1: Prevent/Allow Medium Removal Cdb - Tandberg Data SLR7-140 PROGRAMMER Manual

16.
BYTE BIT 7
00 Operation Code 1Eh
01 Logical Unit Number (LUN)
02 RESERVED
03 RESERVED
04 RESERVED
05 Control Byte

Table 16-1: PREVENT/ALLOW MEDIUM REMOVAL Cdb

PREV

Prevent/Allow Medium Removal

16.1. Command Description

This command is
mechanism. The Drive does not allow medium removal if
any initiator currently has medium removal prevented.
Medium removal
issues a PREVENT MEDIUM REMOVAL command with the PREV-
bit set to one.
cleared by the Initiator that originated the command. It
cannot be cleared by any other Initiator sending an
ALLOW command. While the prevention of media removal is
effective, the Drive will inhibit the eject mechanism
that allows removal of the medium by an operator or by
the UNLOAD command.
It is not an error to attempt to allow medium removal
when medium removal is not currently prevented by this
initiator. It is neither an error to attempt to allow
medium removal
prevented by another
ignored and terminated
initiator has prevented
condition is still valid.
A PREVENT ALLOW MEDIUM REMOVAL command (with a PREV bit
of zero) will be executed even if the Drive is currently
reserved by another Initiator.
If disconnection is allowed, the Drive will disconnect
when executing this command.

16.2. Command Descriptor Block

6 5
A Prevent (PREV)
mechanism. The Drive will not eject the tape following
an UNLOAD command or when the Unload button is pushed.
When it receives UNLOAD, the drive unloads the tape but
leaves it in the
disabled.
A PREV bit of zero enables the eject mechanism. The
Drive ejects the tape following completion of an UNLOAD.
The Unload button is also reenabled.
16-1 Tandberg SLR Product Line SCSI Functional Specifications
used to enable/disable
will be prevented
The PREVENT condition
when medium
initiator.
with GOOD
medium
4 3
RESERVED
bit of one
mechanism.
the
when any Initiator
can only
removal currently
The command will
status. If another
removal, the PREVENT
2 1
disables the
The Unload button
eject
be
is
be
0
PREV
eject
is