FW: help please? corrupted hard disc - invalid super block.

[Ruben Bloemgarten]

It looks like you wrote the disklabel for the slice to the disk or
vice-versa. 
If you check /dev there probably isn't a /dev/ad5s* there. Try mounting
/dev/ad5e instead of /dev/ad5s1e. To verify, do a bsdlabel ad5s1 to see if
you have a disklabel for the slice. Otherwise you could :
1.backup you disklabel 
  #bsdlabel /dev/ad5e > <PATH>disklabel.BAK
2. write a correct disklabel for /dev/ad5s1
  #bsdlabel -w -B ad5s1
3. Edit your disklabel to be correct :
   a. note the size values of #bsdlabel ad5s1
   b. make another backup of your saved disklabel
   c. edit one of the backups and change the size value 
      to the value you got from #bsdlabel ad5s1
   d. write your edited disklabel to ad5s1
      #bsdlabel -R ad5s1 <PATH>disklabel.BAK
      This *should* return no errors.
4. try to mount ad5s1
Now this is all based on them hope that you don't have to erase the
bad/sliceless disklabel on da5.

Good luck,
Ruben   

-----Original Message-----
From: owner-freebsd-questions at freebsd.org
[mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Rob
Sent: Monday, June 28, 2004 11:08 AM
To: questions at freebsd.org
Subject: help please? corrupted hard disc - invalid super block.


Hi!

I have a hard disc that I think must have been set up wrong initially...

It was however working fine, but at some point filled up to capacity, 
wherapon the next reboot it failed to mount.

System is 4.8-RELEASE, Generic Kernel.

Currently the disc shows:

luggage# mount -r /dev/ad5s1e /mnt
mount: /dev/ad5s1e on /mnt: incorrect super block

luggage# disklabel -r ad5
# /dev/ad5c:
type: ESDI
disk: ad5s1
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 14593
sectors/unit: 234441585
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # milliseconds
track-to-track seek: 0  # milliseconds
drivedata: 0

8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
   c: 234436482        0    unused        0     0        # (Cyl.    0 -
14592*)
   e: 234436482        0    4.2BSD    16384 16384   300  # (Cyl.    0 -
14592*)
Warning, partition c doesn't cover the whole unit!
Warning, An incorrect partition c may cause problems for standard system 
utilities

luggage# fsck /dev/ad5s1e
Can't open /dev/ad5s1e: Invalid argument

luggage# fsck -b 32 /dev/ad5s1e
Alternate super block location: 32
Can't open /dev/ad5s1e: Invalid argument

luggage# file -s /dev/ad5s1e
/dev/ad5s1e: can't read `/dev/ad5s1e' (Invalid argument).



At this point I am stuck ... most of the "Invalid Super Block" messages I 
can find when searching relate to cd-roms.

If I could mount the disc even read-only, I could copy the data off.

Can anybody give me any clues on where to go from here?

Thanks in advance,

Rob


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