Date: Sun, 19 Aug 2001 20:24:36 -0700 From: "Mike Burgett" <mburgett@awen.com> To: "Mike Burgett" <mike@zentek.com>, "Valentin Nechayev" <netch@iv.nn.kiev.ua> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@FreeBSD.ORG> Subject: Re: boot crash after hardware change. Message-ID: <200108200324.f7K3OaGv044221@dragon.awen.com> In-Reply-To: <20010819201009.B318@iv.nn.kiev.ua>
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On Sun, 19 Aug 2001 20:10:09 +0300, Valentin Nechayev wrote:
>> I thought if it was DD, it wouldn't have the 4 partition entries...
>> Is this right?
>
>No. Beginning of FreeBSD slice at C/H/S 0/0/1 is "dangerously dedicated".
>Fdisk may reports fictive MBR; I don't know reason of this its strange feature.
>
>I suppose another factor as possible reason: geometry 1496*142*42 means
>8922144 sectors on disk, but fdisk says 8925000 which is more than.
>Moreover, C/H/S values in fictive MBR records are unexplainable: 556*142*42
>is 3315984, (556+1024)*142*42 is 9423120, and both these values are too
>far from expected 8922144 or 8925000. (But, 8925000/556 is rather close
>to 16065 == 255*63, which means tracks of LBA.;))
>All this means problems with detecting your disk geometry.
Yup. Redoing the fdisk info (per the instructions in the handbook)
makes it work:
******* Working on device /dev/da0 *******
parameters extracted from in-core disklabel are:
cylinders=555 heads=255 sectors/track=63 (16065 blks/cyl)
parameters to be used for BIOS calculations are:
cylinders=555 heads=255 sectors/track=63 (16065 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 63, size 8916012 (4353 Meg), flag 80 (active)
beg: cyl 0/ sector 1/ head 1;
end: cyl 554/ sector 63/ head 254
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
After doing this, newfs'ing each partition, and restoring the
dumps I made, it boots fine. I note the space assigned here is
less than the c*h*s size of the disk, by exactly one track.
I'm just happy that its working (I've done 8 'buildworlds' on it
as a bit of a burnin/torturetest) and I didn't have to reinstall.
Thanks for the help!
--Mike
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