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How Do You Use a Dual-Partition Tape?

The easiest way to understand how to use a dual-partition tape is to

think of it as two separate tapes. Just as you would have to physically

change tapes to access data on a second tape, you have to specifically

request that the tape be moved to the other partition before you can

perform actions in that partition. The following are descriptions of

how to perform several typical actions on a dual-partition tape.

Loading a Partitioned Tape

You load a dual-partition tape exactly as you would a standard tape.

However, you have a choice of which partition the EXB-8505

positions the tape to immediately after it is loaded.

The partition that the EXB-8505 positions to by default is the second

partition on the tape. The second partition is typically used as the

data area, while the first partition is used as the directory for the tape.

Because the EXB-8505 positions the tape to the second partition by

default, you can easily append data in the data area, then move back

to the first partition to update the directory. Note that you can

change the default partition to the first partition through an EEPROM

option (see the “Load to partition” option on page A-9).

If you want to override the default partition for the next tape load,

you can use the MODE SELECT command as follows:

1. Before loading the tape, issue a MODE SELECT command and

specify page format (PF=1). (You can do this while the previous

tape is loaded.) With the MODE SELECT command, send

Vendor Unique Parameters Page 2 (Page Code=21h) and specify

the following:

For LPART (Load Partition), indicate which partition you

want the tape to be positioned to. Specify 1 for the first

partition, 0 for the second.

2. Load the tape. The EXB-8505 positions the tape to the beginning

of either the first or second partition, depending on the setting of

LPART.

Note: The setting of LPART remains in effect until the CTS is reset.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

3-27

3 Implementing CTS Operations

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Exabyte EXB-8205 Betriebsanleitung Seite 89