Comments on: Linux: Recover Corrupted Partition From A Bad Superblock

By: Caroline

Caroline — Tue, 07 Feb 2012 05:29:56 +0000

No rsaoen why you can’t run linux if your clients run windows… ;)Just saying there are a lot of good rsaoens to try it out ;)I can respect windows…MS makes life easy in some ways, but I know that after using Linux for 5 years I pull my hair out every time i have to diagnose a problem in windows, or get it to do some specific thing, etc.I don’t want everyone running linux, just enough to make MS improve the bits they are terrible at ;)

By: wcdolphin

wcdolphin — Thu, 12 Jan 2012 07:12:49 +0000

Helped me when restoring from a bad superblock, kudos and hopefully a quick upvote on Google’s search rankings!

By: ChrisH

ChrisH — Thu, 17 Nov 2011 13:03:52 +0000

Great help thanks guys.. Only one issue.
After getting super block issue fixed guess some fragmenting was conducted) I now continue to get the following message:

Inconsistency detected by ld.so: dynamic-link.h: 187: elf_get_dynamic_info: Assertion `info[20]->d_un.d_val == 7′ failed!

So far it’s whenever trying to run firefox, thunderbird, deluge or Virtual box.
Tried removing and re-installing, still no luck. Any suggestions greatly appreciated.

By: cabello

cabello — Wed, 28 Sep 2011 17:33:30 +0000

nice really help me!! regards!

By: Richard

Richard — Tue, 20 Sep 2011 13:57:31 +0000

@Bryn

You need to use the -n switch with fsck

By: Bryn

Bryn — Fri, 26 Aug 2011 15:40:53 +0000

Hi, I still have a problem. Have tried all things suggested in comments, still no luck, just get these errors

freenas:/mnt# mke2fs /dev/ad1
mke2fs 1.41.14 (22-Dec-2010)
/dev/ad1: Operation not permitted while setting up superblock

dumpe2fs /dev/ad1
dumpe2fs 1.41.14 (22-Dec-2010)
dumpe2fs: Bad magic number in super-block while trying to open /dev/ad1
Couldn’t find valid filesystem superblock.

fsck -t ufs /dev/ad1
** /dev/ad1 (NO WRITE)
Cannot find file system superblock
ioctl (GCINFO): Inappropriate ioctl for device
fsck_ufs: /dev/ad1: can’t read disk label

By: Gilbert

Gilbert — Tue, 12 Apr 2011 01:06:07 +0000

Hi there!
Sorry, I can’t find, here in this place, the example where was the explanation in how to recover a NTFS partition with linux utils; I remember I red, that the program asks if the partition was created under Vista.
A friend of mine, needs back his HD, at least, recover his important data, I told him that it could be possible to restore the whole drive too.
Thx!

By: Don

Don — Mon, 11 Oct 2010 23:11:03 +0000

Awesome.

Here is what I did that worked for me.

$ dumpe2fs /dev/sda6
- got just the “Bad magic number in super-block while trying to open…” message
used
$ mke2fs -n /dev/sda6
got the 2nd super block same as in the example.
Used:
$ fsck -b 32768 /dev/sda6
to fix.

Should have used “-a” option to automatically accept fixes because it had a gazillion complaints and I had to lean on the “y” key for 20 minutes. My disk may not be optimally fixed, but I can see the data I was missing before which is a big step forward.

Thanks,!

By: ashwn

ashwn — Fri, 24 Sep 2010 11:33:21 +0000

Yes. Indeed this is a great shortcut – mke2fs -n /dev/XX .

Thank you for suggesting this.

This is a wonderful website with easy to understand and clear text linux resource. Simply, one of the best Linux learning sites on the net.

By: mahendra

mahendra — Wed, 01 Sep 2010 14:56:29 +0000

Good and simple.
I believe we will be able to mount the fs using a diff super block “only” if we r running system in rescue mode with cd media mounted,
I could not mount the fs when the system was live.. instead i was seeing help of mount command

mount sb=”204801″ /dev/hda1 /vol1
Usage: mount -V : print version
mount -h : print this help
mount : list mounted filesystems
mount -l : idem, including volume labels
So far the informational part. Next the mounting.
The command is `mount [-t fstype] something somewhere’.
Details found in /etc/fstab may be omitted.
mount -a [-t|-O] … : mount all stuff from /etc/fstab
mount device : mount device at the known place
mount directory : mount known device here
mount -t type dev dir : ordinary mount command
Note that one does not really mount a device, one mounts
a filesystem (of the given type) found on the device.
One can also mount an already visible directory tree elsewhere:
mount –bind olddir newdir
or move a subtree:
mount –move olddir newdir
A device can be given by name, say /dev/hda1 or /dev/cdrom,
or by label, using -L label or by uuid, using -U uuid .
Other options: [-nfFrsvw] [-o options] [-p passwdfd].
For many more details, say man 8 mount .

any clues on this?

By: Ashwin

Ashwin — Sat, 20 Mar 2010 15:45:43 +0000

hi.. Even after i run d command i m gettin a ‘couldnt find ext2 superblock. Tryin backup blocks’ n then a bad magic number in superblock again! I ve lot of data n desperately need to retrieve them..

Thanks,
Ashwin

By: Jaciss

Jaciss — Mon, 01 Mar 2010 00:28:03 +0000

Thank you! Successfully recovered my data, and with much less stress than I might have had due to the clear explanations. Thanks also to ShadowCat8 – I was getting magic error numbers with the other method of finding the superblock locations.

By: Evan

Evan — Sun, 03 Jan 2010 02:39:12 +0000

thank you so much, this is valuable information, and it saved me a LOT of work!!!!!

thanks for the write up, awesome, worked like a charm on ubuntu 9.10 off live cd rescuing a / partition on my HDD

By: Vivek Gite

Vivek Gite — Mon, 28 Dec 2009 11:33:04 +0000

@uncle max

You can.. but I strongly recommend backup instead of just superblocks. Linux comes with rsnapshot backup tool that can make hourly, daily and weekly backup of all your servers. If you are old school UNIX person, tar, dump and restore are regular tools for backup.

HTH

By: uncle max

uncle max — Mon, 28 Dec 2009 07:06:44 +0000

Hi, this looks like a potential lifesaver. Great Stuff. Question: do superblocks ever move?? Obviously i don’t know ext3 filesystem internals — too much to learn, so little time… My point is: would there be any value in storing the list of superblock locations offline?

Thanks,
Marty.

By: ShadowCat8

ShadowCat8 — Mon, 02 Nov 2009 23:33:12 +0000

Another way to cut to the quick of finding out where your superblocks should be after losing your primary is to use the following command:
# mke2fs -n /dev/[device and partition number]
This is making the utility you used to create the filesystem tell you where the backups are. You get a response similar to this:
# mke2fs -n /dev/sdb1 mke2fs 1.39 (29-May-2006) Filesystem label= OS type: Linux Block size=1024 (log=0) Fragment size=1024 (log=0) 62248 inodes, 248976 blocks 12448 blocks (5.00%) reserved for the super user First data block=1 Maximum filesystem blocks=67371008 31 block groups 8192 blocks per group, 8192 fragments per group 2008 inodes per group Superblock backups stored on blocks: 8193, 24577, 40961, 57345, 73729, 204801, 221185

Now, remember when using this command, you need to use the same flags you used when you created the filesystem originally, and just add ‘-n’ to them. If you made an ext3 filesystem, you would use:
# mke2fs -j -n /dev/[device and partition number]

HTH.

By: rick

rick — Thu, 29 Oct 2009 18:42:41 +0000

Does not seem to work, when I run dumpefs all it says:

“Bad magic number in super-block while trying to open…”

I already know the superblock is bad.

By: Phillip

Phillip — Wed, 07 Oct 2009 17:10:39 +0000

Worked perfectly under RHEL5. Notes on my issue are below

I was getting following error when mounting.
Wrong fs type, bad option, bad superblock on /dev/sdd1
missing codepage or other error
In some cases usefull info is foinf in syslog – try
dmesg | tail or so

dmeg | tail displayed
EXT3-fs: filesystem has both journal and inode journals!

I tried useing the tune2fs -f -O ^has_journal /dev/sdd1 to remove the journal and try recreating but it did not work. tune2fs just hung there sucking 100% CPU when trying to remove the journal

The command given here worked great.

By: Phillip

Phillip — Wed, 07 Oct 2009 17:06:29 +0000

Awesome. Worked Perfectly on RHEL5

By: Martin

Martin — Wed, 02 Sep 2009 21:26:06 +0000

Awesome. Thanks.
This is exactly what I needed instead of all the opinion with no solution.