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- Path: sparky!uunet!stanford.edu!agate!violet.berkeley.edu!lele
- From: lele@violet.berkeley.edu (Sharachchandra Lele;100 BldgT-4;26886;5106440692;NT23)
- Newsgroups: comp.os.msdos.misc
- Subject: Re: DRDOS-6 SLACKSPACE
- Date: 25 Jul 1992 06:56:24 GMT
- Organization: University of California, Berkeley
- Lines: 38
- Sender: Sharad Lele
- Message-ID: <14qtuoINNpei@agate.berkeley.edu>
- References: <709746269.F00001@csource.oz.au>
- NNTP-Posting-Host: violet.berkeley.edu
- Summary: Slack space cannot be eliminated
-
- In article <709746269.F00001@csource.oz.au> Brian.Bloomer@f386.n632.z3.fidonet.org (Brian Bloomer) writes:
- >I'VE FOUND DRDOS-6 EXCELLENT HOWEVER,MY 40MG. HARDDISK COMPRESSED OUT TO 84
- >MB'S, UNFORTUNATELY ONLY 56 MB'S CAN BE UTILISED 25 MG'S ARE TAKEN UP WITH 25
- >MB'S OF SLACK SPACE. COULD ANYONE EXPLAIN SLACK SPACE AND IF POSSIBLE HOW TO
- >OVERCOME THIS THAT IS,IF IT CAN BE.
- >ANY ASSISTANCE WOULD BE VERY WELLCOME.
- >
-
- I am not sure all the discussion about cluster size etc. has really
- answered Brian's question, which is: if he has a 40MB harddisk, why
- does he not get the full 80 MB indicated after compression?
-
- I have been using DRDOS-6 w/ Superstor for quite some time, and have
- noticed the same problem. I called DRI and also had an email reply from
- their techsup group. Basically, SSTOR does not give a GUARANTEED
- compression ratio of 2:1. The actual compression achieved depends upon
- the type of file being compressed. Thus, e.g., a .WK1 file often gets
- compressed to LESS than 50% of its original size. The same is true of
- many other "data" file formats. On the other hand, .EXE and similar
- program files cannot get compressed to that extent. Thus, when I load
- lots of software on my 20MB (physical) harddisk, I don't get the 40MB
- I would wish to, but rather end up with around 32MB. (this was
- confirmed by Toshiba's technical support group too).
-
- I have tried to verify this by monitoring the slack space thru XTGOLD.
- And I find that if I load a whole bunch of data files, the slack space
- actually DECREASES, which is what one expects if the data files are
- getting compressed by more than factor of 2.
-
- In short, you cannot do anything about the slack space, it is a fact of
- life with the compression setup. "Dont load so much software" is the
- only suggestion that i can give!
-
- --Sharad Lele
- Energy & Resource Group
- Univerity of California, Berkeley
-
- Electronic-mail: lele@violet.berkeley.edu (Internet)
-