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I have a HD in pretty bad shape. I'm prepared to accept is dead but I'd like to recover the data from it.

Running badblocks on it gives a HUGE list of numbers.

Trying to run fsck.ext4 on it just says:

fsck.ext4: Attempt to read block from filesystem resulted in short read while trying to open /dev/sdd1

So I guess the first superblock is fried.

I'm trying to use a backup super block so I'm trying to determine where it is with dumpe2fs but I just get:

$ sudo dumpe2fs /dev/sdd
dumpe2fs 1.42.9 (4-Feb-2014)
dumpe2fs: Attempt to read block from filesystem resulted in short read while trying to open /dev/sdd1

I guess everything is reading my HD as being empty, isn't it?

Is there any way to recover it?

Is there any way to guess the location of a superblock backup?

Thanks a lot.

8

When the command dumpe2fs /dev/sdd sent an error, there is an other way to obtain the location of a superblock backup :

mkfs.ext4 -n /dev/sdd

From the man mkfs.ext4

-n Causes mke2fs to not actually create a filesystem, but display what it would do if it were to create a filesystem. This can be used to determine the location of the backup superblocks for a particular filesystem, so long as the mke2fs parameters that were passed when the filesystem was originally created are used again.

Then, you just have to repair your partition using the superblock:

fsck -b 98304 /dev/sdd

replace 98304 by your superblock's number.

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  • I got a valid superblock and I'm fscking now. Everything points to, not only a great answer but also a solution for (some of the) data on my HD. Thanks. I'll wait for the process to end before accepting but it seems great. Apr 22 '16 at 14:26
  • You're welcome. Try to help when I can.
    – monitor35
    Apr 22 '16 at 14:28
  • It worked awesomely. I've recovered most of my data. Thanks Apr 26 '16 at 8:39
  • It didnt work for me , Please can u provide another solution . I tried with all the backup superblocks . (I have done dd if=/dev/mmcop1 of=/dev/zera ) So whole data is wipedout from disk , (Lost all the backups) . i have also tried testdisk .
    – yunus
    Jun 9 '20 at 6:11
  • If u can anser my question . It is most likely u have answered superuser.com/questions/1281168/…
    – yunus
    Jun 9 '20 at 6:12

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