I have had a little issue with one of my disks, the usb cacble was pulled out and one of the external drives on it would no longer mount. I used First Aid and it verified and repaired both OK / nothing to do). After lots of messing around and not being able to mount I used Drive Genius 2 and that verified / rebuilt OK again with nothing to do.

Next I used that to duplicate to a disk image. At this point I re-formatted the disk and thats working fine now. The image I created has the same issue. I can see the partition in there but Disk Util / hdiutil can not mount the image. I get the following when trying to fsck the image (or disk before I reformatted):

BAD SUPER BLOCK: MAGIC NUMBER WRONG

I wrote a quick script and found 1 additional super block but fsck seg faults when I use that.

Some more info:

"./disk2s1.dmg: Macintosh HFS Extended version 4 data last mounted by: 'fsck', created: Sat Mar 7 18:42:44 2009, last modified: Mon Jun 1 08:40:53 2009, last checked: Sat Mar 7 18:42:44 2009, block size: 4096, number of blocks: 4883752, free blocks: 95358"

Its only a small 20GB drive. There are scripts and files I would like to recover but have no way to get this anyone have any ideas?

A simple:

cat disk2s1.dmg | strings

I can see file names I know are on the drive, so the data does seem to be intact just no easy way to get at it.