Date: Wed, 05 Mar 1997 11:47:43 -0800 From: Robert Clark <ROBERTC@PII.COM> To: toor@dyson.iquest.net Cc: freebsd-questions@freebsd.org Subject: Re: (DOS) Partition Size / Cluster Size. -Reply Message-ID: <s31d5e95.019@pii.com>
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My real intent, was to get that info out on the list. I used FIPS to shrink a partition some time ago, and didn't know what cluster size was based on. I'm just trying to put some useful info out there. FWIW, Quarterdeck's Partition It, should be able to dynamicly change cluster size. (I haven't tested it yet.) [RC] >>> John S. Dyson <toor@dyson.iquest.net> 03/04/97 09:58pm >>> > > (DOS) > Partition Size Cluster Size > 1-31MB 512bytes > 32-63MB 1k > 64-127MB 2k > 128-255MB 4k > 256-511MB 8k > 512-1023MB 16k > 1024-2047MB 32k > > If you use FIPS to shrink a > partition, don't cross a boundary > above? > I don't know what you are really asking, but on FreeBSD V2.1.X DO NOT use a DOS filesystem that has a cluster size of greater than 16K. If you shrink a filesystem with FIPS, you'll not shrink the cluster size, and will still have problems if the cluster size is greater than 16K. Anecdote: I just tried to install FreeBSD from a DOS partition today. (It was 2.1.6). It wouldn't install properly. Found out that the DOS partition was 1.6GB!!! We rebuilt the disk so that it had a 500MB partition (from scratch, not using FIPS), and the install went fine. So, don't even mount a DOS FS with cluster size of greater than 16K read-only -- if you do, you will be placing the rest of your filesystems at risk. FreeBSD V2.2 apparently has the problem fixed. John dyson@freebsd.org
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