HD error: BAD SUPER BLOCK

[Robert Neumann]

Hello there,

this is the problem:
I had a machine running FreeBSD 4.7-Stable. There I added a 80GB 
harddisk. This harddrive I wanted to install on my other machine running 
FreeBSD 4.9-Release. This disk is ad6 so I added

	/dev/ad6	/storage	ufs	rw	2	2

to fstab and rebooted.

While booting the kernel the following error came up:
        ...
        /dev/ad6: BAD SUPER BLOCK: MAGIC NUMBER WRONG
        /dev/ad6: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY
        ...
        THE FOLLOWING FILE SYSTEM HAD AN UNEXPECTED INCONSISTENCY
                /dev/ad6 (/storage)
        automatic file system check failed . .  help!
        Enter full path name of shell or RETURN for /bin/sh:
I hit Return and type
        fsck
which give this output:
        ...
        ** /dev/ad6
        BAD SUPER BLOCK: MAGIC NUMBER WRONG
        /dev/ad6; NOT LABELED AS A BSD FILE SYSTEM (unused)
I searched the intenet and found this way:
        fsck -b 32
which gives this output for /dev/ad6:
        ...
        BAD SUPER BLOCK: MAGIC NUMBER WRONG
Now I tried another way I found on the net:

	dd if=/dev/ad6 skip=32 of=/dev/ad6 seek=16 bs=512 count=16

which gives this output:
        16+0 records in
        16+0 records out
        8192 bytes transferred in 0.024632 secs (332576 bytes/sec)
when I want to leave the shell there are still errors until I remove the 
added line in /etc/fstab.

the output of
        fdisk -t ad6
is the following:
        ...
        sysid 165,(FreeBSD/NetBSD/386BSD)
            start 63, size 160071597 (78159 Meg), flag 80 (active)
                beg: cyl 0/ head 1/ sector 1;
                end: 1023/ head 254/ sector 63;
        ...
the output of /stand/sysinstall ->Configure->Fdisk->ad6 is:

Offset          Size(ST)      END   Name   PType  Desc   Subtype  Flags
0                 63           62     -     6   unused   0      
63         160071597    160071659   ad6s1   3   freebsd  165      C
160071660      14868    160086527     -     6   unused   0      
I don't know what is wrong but I don't want to lose the data.

Any hint is appreciated.

Thanks a lot,
Robert
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