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Using the LOAD/UNLOAD Command on a Partitioned Tape

When the tape you are using is formatted with two partitions (see

Section 3.7), the LOAD/UNLOAD command performs as follows.

Loading a Partitioned Tape

The LOAD command positions the tape to the beginning of the

second partition by default, unless one of the following has occurred:

Before loading the tape, you set the LPART (Load Partition) bit in

the MODE SELECT command to 1, indicating that the EXB-8505 is

to position the tape to the beginning of the first partition.

The EXB-8505’s EEPROM is set to position the tape to the

beginning of the first partition instead of the second.

Note that the LOAD command itself has no fields that specify which

partition the EXB-8505 positions the tape to.

Unloading a Partitioned Tape

The UNLOAD command unloads a dual-partition tape just as it

would a single-partition tape. You can issue the UNLOAD command

from either partition. The EXB-8505 rewinds the tape to PBOT,

unloads the tape from the tape path, and ejects the cartridge.

Tape Motion Command Received during Load Operation

An EEPROM option is available to control how the CTS handles tape

motion commands during the load operation (see Appendix A,

Command queuing option). Depending on the CTS’s EEPROM

image, the CTS performs one of the following actions when it receives

tape motion commands during a load operation:

It queues (holds) one tape motion command (and disconnects, if

allowed) until the load operation is complete. Then it attempts to

execute the queued command.

It returns Busy status and does not queue commands.

It returns Check Condition status with the sense key set to Not

Ready and does not queue commands.

Note: If another initiator has reserved the CTS for its exclusive use,

the CTS returns Reservation Conflict status.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

6-3

6 LOAD/UNLOAD (1Bh)

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Exabyte EXB-8205 Betriebsanleitung Seite 117