HD error: BAD SUPER BLOCK
Robert Neumann
shritis at gmx.de
Fri Nov 21 01:53:18 PST 2003
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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