Example 1; Example 2 - Compaq StorageWorks SDLT 110 Reference Manual

The INITIALIZE command controls whether data records are automatically
compacted and blocked together on any device that supports data compaction. Data
compaction and record blocking increase the amount of data that can be stored on a
single tape cartridge.
NOTE: Once data compaction or non-compaction has been selected for a given cartridge, that
same status applies to the entire cartridge.
The format for the MOUNT command is:
MOUNT
/MEDIA_FORMAT
COMPACTION

Example 1

$ MOUNT/FOREIGN/MEDIA_FORMAT=COMPACTION MKA400: BOOKS
This command performs a foreign mount of a tape with data compaction and record
blocking enabled and assigns the logical name BOOKS to the tape.

Example 2

$ INIT/MEDIA_FORMAT=NOCOMPACTION MKA400: BOOKS
$ MOUNT/MEDIA_FORMAT=COMPACTION MKA400: BOOKS
This MOUNT command attempts a Files-11 mount of a tape labeled BOOKS with data
compaction and record blocking enabled. Because the tape was initialized with
compaction disabled, the MOUNT qualifier /MEDIA_FORMAT=COMPACTION has no effect.
StorageWorks SDLT Tape Drive by Compaq Reference Guide
Operating System Device Drivers
2–7