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- From: franks@hpuamsa.neth.hp.com (Frank Slootweg CRC)
- Date: Mon, 7 Sep 1992 12:29:20 GMT
- Subject: Re: DR DOS v6/STOR Question
- Message-ID: <27800025@hpuamsa.neth.hp.com>
- Organization: Hewlett-Packard, The Netherlands
- Path: sparky!uunet!usc!sdd.hp.com!scd.hp.com!hplextra!hpcc05!hpbbn!hpuamsa!franks
- Newsgroups: comp.os.msdos.misc
- References: <7988@lee.SEAS.UCLA.EDU>
- Lines: 29
-
- ygoland@edison.seas.ucla.edu (The Jester) writes:
-
- > The only 'funny' thing we can find is that chkdsk tends to give
- > REALLY bad estimates. I know it uses a 2:1 estimate but it does
- > things like say we have 7 megs of free space when we only have 100k.
-
- This is normal when your disk is becoming full. An example: Suppose
- you SSTOR a 20MB physical partition. CHKDSK will use a 2:1 estimate for
- the compression factor and will say that this disk can store 40MB.
- Suppose that you now store some files which would take 27MB if they were
- not compressed and that SuperSTOR can compress these files with an
- average compression factor of 1.5:1. So these files physically take
- 18MB, so physically there is 2MB left. CHKDSK will however report in the
- following way :
-
- 40MB "total disk space" (i.e. the *estimated* capacity)
- 27MB "in ... files" (i.e. the *uncompressed* size of the files)
- 13MB "available on disk" (i.e. "total - used")
-
- So CHKDSK reports "available" as "total - used", but physically there
- is only 2MB left, which is the number which SSTOR will report. IMHO this
- is not a CHKDSK deficiency, but just a side effect of the transparency
- which SuperSTOR provides.
-
- If you want to know how much disk space is actually/physically
- available, then run SSTOR, or do a DIR and divide the reported number of
- available bytes by 2 (the estimated compression factor).
-
- Frank Slootweg
-