HP 330834-B21 - StorageWorks Ultrium 460 Tape Library Drive Module User Manual page 59

will always limit the speed at which the drive can write/read data. You will achieve no more than
native rates with uncompressible data.
Examples of files that compress well are plain text files, spreadsheets; those that compress poorly are
those that are either compressed as part of their format (such as, JPEG photographic files) or stored as
compressed (such as, .ZIP files or .gz/.Z files on Unix platforms).
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Ultrium full-height SCSI Tape Drives