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Date: Tue, 13 Oct 1998 02:14:03 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199810121614.CAA12373@godzilla.zeta.org.au>
To: bright@hotjobs.com, zach@gaffaneys.com
Subject: Re: bitten 3 times already.
Cc: current@FreeBSD.ORG
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>Also:
>wdc0 at 0x1f0-0x1f7 irq 14 flags 0x7fff7fff on isa
>wdc0: unit 0 (wd0): <IBM-DHEA-38451>, LBA, DMA, multi-block-16, sleep-hack
>wd0: 8063MB (16514064 sectors), 17475 cyls, 15 heads, 63 S/T, 512 B/S
>
>i'm quite sure i have LBA translations going on, however i'm kinda certain
>that the disk driver isn't running amok because all my other partitions
>were fine (except /usr)
>
>thank you for taking the time to help me with this, go an idea of what's
>going on here? 

Dumps and LBA mode should't be mixed, since the dump routine doesn't
support LBA mode and it uses CHS mode with nominal geometry if LBA mode
is configured.  Dumps only work if the nominal geometry is the same as
the actual one.  Otherwise, dumps write sectors to the wrong places,
possibly outside the partition.

I don't know how the geometry can be H=15/S=63.  This looks like the
actual geometry, but the probe should report the nominal one which should
be H=255/S=63 for this size of drive.  It's suprising that this size of
drive is made.  It's only 31MB over the 1024*255*63 limit, and exceeding
this limit causes problems.

Fix: don't use LBA mode.  CHS mode should work up to size 65535*255*63
sectors if it works at all.

Bruce

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