Mounting/examining dd image?

[Chad Gross]

On Nov 3, 2007 3:38 PM, Jon Drukman <jdrukman at gmail.com> wrote:

> On Nov 3, 2007 9:23 AM, Warren Block <wblock at wonkity.com> wrote:
> > vnconfig is the predecessor of mdconfig.  It should be present in 4.9.
>
> thanks, it is.  however, i am unable to mount the vnconfig'd device.
> any ideas?  i made the backup originally just by doing dd if=/dev/ad0
> of=some.file
>
> then i ran vnconfig vn0 some.file
>
> if i dd /dev/ad0 i see all the boot sector stuff, etc.  however i
> can't use disklabel or mount.
>
> # disklabel -r vn0
> disklabel: bad pack magic number (label is damaged, or pack is unlabeled)
> # disklabel -r vn0a
> disklabel: bad pack magic number (label is damaged, or pack is unlabeled)
> # disklabel -r vn0b
> disklabel: bad pack magic number (label is damaged, or pack is unlabeled)
>
> # mount /dev/vn0s1a /mnt
> mount: /dev/vn0s1a on /mnt: incorrect super block
>

You have to mount the device with 'mount -t cd9660' because it is an ISO
which is a cd9660 format.


>
>
> it seems like the data is there but i don't know how to access it.
>
> 00000000  fc 31 c0 8e c0 8e d8 8e  d0 bc 00 7c be 1a 7c bf
>  |.1.........|..|.|
> 00000010  1a 06 b9 e6 01 f3 a4 e9  00 8a 31 f6 bb be 07 b1
>  |..........1.....|
> 00000020  04 38 2f 74 08 7f 78 85  f6 75 74 89 de 80 c3 10
>  |.8/t..x..ut.....|
> 00000030  e2 ef 85 f6 75 02 cd 18  80 fa 80 72 0b 8a 36 75
>  |....u......r..6u|
> 00000040  04 80 c6 80 38 f2 72 02  8a 14 89 e7 8a 74 01 8b
>  |....8.r......t..|
> 00000050  4c 02 bb 00 7c 80 fe ff  75 32 83 f9 ff 75 2d 51
>  |L...|...u2...u-Q|
> 00000060  53 bb aa 55 b4 41 cd 13  72 20 81 fb 55 aa 75 1a  |S..U.A..r
> ..U.u.|
> 00000070  f6 c1 01 74 15 5b 66 6a  00 66 ff 74 08 06 53 6a  |...t.[
> fj.f.t..Sj|
> 00000080  01 6a 10 89 e6 b8 00 42  eb 05 5b 59 b8 01 02 cd
>  |.j.....B..[Y....|
> 00000090  13 89 fc 72 0f 81 bf fe  01 55 aa 75 0c ff e3 be
>  |...r.....U.u....|
> 000000a0  bc 06 eb 11 be d4 06 eb  0c be f3 06 eb 07 bb 07
>  |................|
> 000000b0  00 b4 0e cd 10 ac 84 c0  75 f4 eb fe 49 6e 76 61
>  |........u...Inva|
> 000000c0  6c 69 64 20 70 61 72 74  69 74 69 6f 6e 20 74 61  |lid partition
> ta|
> 000000d0  62 6c 65 00 45 72 72 6f  72 20 6c 6f 61 64 69 6e  |ble.Error
> loadin|
> 000000e0  67 20 6f 70 65 72 61 74  69 6e 67 20 73 79 73 74  |g operating
> syst|
> 000000f0  65 6d 00 4d 69 73 73 69  6e 67 20 6f 70 65 72 61  |em.Missing
> opera|
> 00000100  74 69 6e 67 20 73 79 73  74 65 6d 00 00 00 00 00  |ting
> system.....|
> 00000110  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>  |................|
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-- 
Chad M. Gross