Disk Stacker Software
23-Feb-92 11:24:43
Sb: #9639-Disk Stacker Software
Fm: Matthew J. D'Errico 70744,3405
To: Roger Danielsen 70323,3034
Rojer —
There are two kinds of "data compression" software: realtime and not.
Based on your subj. heading, it sounds like you're looking at realtime
compression, such as stacker, or somthing like it. I think you'll find
that depending upon what application (and thus what version of .TGA) you'll
only achieve a 10% compression at best. For the most part, I don't think
you should plan on any savings if you're only interest is storing
compressed TARGA files… The purpose of "compressed" TARGA and GIF is to
give you the "realtime" compression buit-in to the file format, rather than
external (on the disk).
Non-Realtime compression utilities such as PKZIP, LHArc, etc… Offer a
much higher compression ratio at a cost — speed. They don't run
"realtime", but if you can live with that, you can expect better
compression. Still, though, you can't expect more than say 30%, again,
depending upon the version of TARGA (and the version of the archiver,
they're constantly surpassing each other in performance and compression
ratios)…
Now, if you're looking to put "uncompressed" files on a stacker, or disk
doubler drive… I recommend it highly. I'm personally running stacker on
2/3 of a 200MB disk. I have a "partition" (quotes intended) left
"unstacked" for Windows SWAP, temp files, and yes, .ZIPs, .TGAs, and
.GIFs… I have over 400MB of files on this 200MB drive, and I still have
over 100MB reported free ! I don't suffer from any noticeable performance
loss, and swear by the reliability.
Hope this helps —
— Matt