Date: Tue, 23 Jul 1996 13:45:25 +0200 (SAT) From: Robert Nordier <rnordier@iafrica.com> To: bde@zeta.org.au (Bruce Evans) Cc: current@freebsd.org, hackers@freebsd.org Subject: Re: anyone working on upgrading the msdosfs to NetBSD levels? Message-ID: <199607231145.NAA00292@eac.iafrica.com> In-Reply-To: <199607230808.SAA24449@godzilla.zeta.org.au> from "Bruce Evans" at Jul 23, 96 06:08:47 pm
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Bruce Evans wrote:
>
> >myself. However, the most serious FreeBSD msdosfs problem (where
> >it causes corruption to other partitions) apparently needs a
> >64-cluster FIPS-ed FAT filesystem with an EIDE controller translating
> >to 64 heads, 63 sectors to be readily reproducible. (At least, I
> >haven't reproduced it on any other 64-cluster filesystems.)
>
> I think you're saying that it is a hardware problem :-).
>
> Bruce
>
Over a few months, I've been collecting drive and DOS fs parameters
when users have reported corruption to *BSD partitions after
accessing (mounting/reading: not necessarily writing to) their DOS
filesystems using msdosfs.
The details I have (from 4 users) are summarized below. Incomplete
details from 2 further users also indicate /dev/wd? and 400M+
partition sizes (but I'm not sure about the 64/63 geometry).
I don't currently have easy access to an IDE setup supporting more
than 16 heads. Through fairly devious means, I have tried formatting
various DOS filesystems _as if_ they were originally created on such
as setup (and then FIPS-ed), but this doesn't reproduce the problem.
DRIVE DOS START DOS END
cyl head sect || cyl head sect cyl head sect size
-------------------------------------------------------------------
wd0 | 525 | 64 | 63 || 0 | 1 | 1 | 126 | 63 | 63 | 512001
wd0 | 2099 | 64 | 63 || 0 | 1 | 1 | 189 | 63 | 63 | 766017
same drive || 250 | 0 | 1 | 523 | 63 | 63 | 1104768
wd0 | 788 | 64 | 63 || 0 | 1 | 1 | 787 | 63 | 63 | 3177153
wd0 | 621 | 64 | 63 || 0 | 1 | 1 | 619 | 63 | 63 | 2499777
--
Robert Nordier
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