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Date:      Tue, 17 Nov 2009 10:02:51 -0500
From:      Jerry McAllister <jerrymc@msu.edu>
To:        Peter <fbsdq@peterk.org>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: freebsd partitions on a dos/fat slice?
Message-ID:  <20091117150251.GB54167@gizmo.acns.msu.edu>
In-Reply-To: <c391424fe909ea2c17176382cf7b511c.squirrel@webmail.pknet.net>
References:  <c391424fe909ea2c17176382cf7b511c.squirrel@webmail.pknet.net>

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On Sun, Nov 08, 2009 at 02:52:57AM -0700, Peter wrote:

> iH,
>   Pulled an old disk lying around...
>  and started mounting partitions in it.
> The weird thing is that the first slice [~15GB] is said to be fat, but I
> do have freebsd partitions on it:
> 
> denver:#mount|grep ad10
> /dev/ad10s1a on /maxtor500GB (ufs, NFS exported, local, soft-updates)
> /dev/ad10s1d on /maxtor500GB/var (ufs, local, soft-updates)
> /dev/ad10s1f on /maxtor500GB/usr (ufs, local, soft-updates)
> /dev/ad10s1e on /maxtor500GB/tmp (ufs, local, soft-updates)
> /dev/ad10s3d on /maxtor500GB/data (ufs, NFS exported, local, soft-updates)
> /dev/ad10s2d on /maxtor500GB/data2 (ufs, local, soft-updates)
> 
> denver:#fdisk /dev/ad10
> ******* Working on device /dev/ad10 *******
> parameters extracted from in-core disklabel are:
> cylinders=969021 heads=16 sectors/track=63 (1008 blks/cyl)
> 
> Figures below won't work with BIOS for partitions not in cyl 1
> parameters to be used for BIOS calculations are:
> cylinders=969021 heads=16 sectors/track=63 (1008 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 6 (0x06),(Primary DOS, 16 bit FAT (>= 32MB))
>     start 63, size 31455207 (15358 Meg), flag 0
>         beg: cyl 0/ head 1/ sector 1;
>         end: cyl 1023/ head 254/ sector 63
> The data for partition 2 is:
> sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
>     start 31455270, size 31455270 (15359 Meg), flag 80 (active)
>         beg: cyl 1023/ head 255/ sector 63;
>         end: cyl 1023/ head 254/ sector 63
> The data for partition 3 is:
> sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
>     start 62910540, size 913857525 (446219 Meg), flag 0
>         beg: cyl 1023/ head 255/ sector 63;
>         end: cyl 1023/ head 254/ sector 63
> The data for partition 4 is:
> <UNUSED>
> denver:#
> 
> There are what appears to be a freebsd base install from Jul 19/20th 2007
> on /dev/ad10s1{a,d,e,f}
> 
> denver:#ls -l /maxtor500GB/tmp/
> total 2
> drwxrwxr-x  2 root  operator  512 Jul 20  2007 .snap
> 
> denver:#ls -l /maxtor500GB/
> total 38
> drwxrwxr-x   2 root  operator   512 Jul 20  2007 .snap
> drwxr-xr-x   2 root  wheel     1024 Jul 19  2007 bin
> drwxr-xr-x   7 root  wheel      512 Jul 19  2007 boot
> ..
> ....
> denver:#df -hl|grep ad10
> /dev/ad10s1a              496M     11M    445M     2%    /maxtor500GB
> /dev/ad10s1d              989M    106K    910M     0%    /maxtor500GB/var
> /dev/ad10s1f               16G     97M     15G     1%    /maxtor500GB/usr
> /dev/ad10s1e              727M    580K    668M     0%    /maxtor500GB/tmp
> /dev/ad10s3d              422G    384G    4.0G    99%    /maxtor500GB/data
> /dev/ad10s2d               15G     11G    2.5G    81%    /maxtor500GB/data2
> 
> 
> running sysinstall also show s1 as 'fat'
> 
> I've been writing/reading a lot of data from it just fine - Curios why s1
> is being detect as a 'fat' partition and not a fbsd slice.
> Have not tried to put this disk into a windows/another box...

I don't know why other than it has apparently been marked 
with an fstype (sysid) of 6 at some time.   Maybe something
started and went long enough to muck with the slice table but
then did nothing else.

Anyway, if you can mount, read and write it OK, I would not 
worry too much.   If you plan to wipe and it for a new install
it should not be a problem.

////jerry


> 
> ]Peter[
> 
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