Trying to recover data from FreeBSD 4.11 system

[Joe Demeny]

On Thursday 14 February 2008 04:49:05 am you wrote:
> > possibly try fsck - i don't know (my first FreeBSD was 5.*) but maybe UFS
> > changed a bit?
>
> Nope, I have had machines that I upgraded from 4 to 5 and 6 without
> changing the hard disk, and without changing the file system.
>
> > So, I installed this drive as the second hard drive in a FreeBSD 6.2
> > system and I tried to mount it, but I got "incorrect super block".
>
> With no old disk installed, what is your mounted disks/partitions?
> Result of mount -p.

Old disk is installed, but nothing is mounted from it:

# mount -p
/dev/ad0s2a     /       ufs rw  1 1
devfs   /dev    devfs rw        0 0
/dev/ad0s2e     /tmp    ufs rw  2 2
/dev/ad0s2f     /usr    ufs rw  2 2
/dev/ad0s2d     /var    ufs rw  2 2

> If you have it what was the result of mount -p on the old machine.

I don't have that, unfortunately.

> What is the result of "fdisk /dev/ad0" ?

# fdisk /dev/ad0
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=310101 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=310101 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 7 (0x07),(OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX)
    start 63, size 40965687 (20002 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 40965750, size 271610955 (132622 Meg), flag 80 (active)
        beg: cyl 1023/ head 255/ sector 63;
        end: cyl 1023/ head 254/ sector 63
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>

> Install the old hard disk, what is the result of "fdisk /dev/ad1" ?

# fdisk /dev/ad1
******* Working on device /dev/ad1 *******
parameters extracted from in-core disklabel are:
cylinders=13232 heads=15 sectors/track=63 (945 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=13232 heads=15 sectors/track=63 (945 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 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 63, size 12498507 (6102 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 777/ head 254/ sector 63
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>

-- 
Joe Demeny