Backup Superblocks

Stephen Samuel samuel at
Sat Oct 11 21:41:09 UTC 2008

It stores them in various places, depending on the size of your filesystem.
If your filesystem is large enough (>~ 1/2 GB) you'll probably find it at
block #32768.
For smaller filesystems, it appears to put the first backup at block # 8193

You can get more details by using the -n option to mkfs. If you used
nonstandard options in your original mkfs, you might want to provide those
details here, as well.  (( -n has mkfs.ext[23] not actually write to the
partition but simply say what it *WOULD* do if it did. ))

mkfs -t ext2 -n /dev/mydeice

On Sat, Oct 11, 2008 at 2:01 PM, John Nelson <articpenguin3800 at>wrote:

> Where does ext3 store the backup superblock? Does it have one at the very
> beginning of the partition and one at the very end?
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> Ext3-users mailing list
> Ext3-users at

Stephen Samuel
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