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1995-03-09
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45 lines
Short: A compressing disk device v37.5; uses XPK
Uploader: rhialto@mbfys.kun.nl (Olaf Seibert)
Type: util/pack
RCSId: $Id: README,v 1.3 1993/11/08 13:22:13 Rhialto Rel $
Overview
********
`xpkdisk.device' is an exec-style device that looks like
trackdisk.device and similar disks. The difference is that it compresses
its data and stores it in multiple files in an existing filesystem.
* Now includes a utility to reclaim space from deleted files.
* Now uses a hierarchical track naming scheme for faster access!
* Now behaves better in cace of threatening lack of disk space.
* Now handles read-only media.
It uses the XPK (eXternal PacKer) standard to do the actual
compression. This has many advantages:
* You can choose which compression is most effective for your
purpose. For one disk, you might want a very tight compression
that is slow, for another you may prefer a faster but less
efficient compression.
* As soon as another XPK library is released, you can use it for your
compressed disk(s).
* Because each track is a standard XPK-compressed file, you can use
the normal XPK utilities to uncompress your data, should you wish
to do so.
* You can change the compression type of a disk on-the-fly. All
already compressed data remains perfectly usable, but upon
re-compression your new choice will be used.
* You can even manually decompress and recompress your disk (when
xpkdisk is not accessing it, of course) with another compression
method.