Date: Tue, 13 Oct 1998 02:31:49 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, bright@hotjobs.com, zach@gaffaneys.com Cc: current@FreeBSD.ORG Subject: Re: bitten 3 times already. Message-ID: <199810121631.CAA13430@godzilla.zeta.org.au>
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>>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 wrote:
>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.
The geometry is forced to a possibly wrong value, er shape, using the
WDOPT_FORCEHD bits (0x0f000f00). Normally this is a no-op, since the
driver tells the drive which geometry to use, but the driver doesn't
bother to tell the drive this if LBA mode is configured, so a mismatch
is possible.
Bruce
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