Greetings!

Assuming you used the builder software to build the drive, the command that should have been run to generate the filesystem was: "mke2fs -m 0 -b 1024 -i 131072" according to Roger's manual build page. If you run the same command with a -n switch like this "mke2fs -n -m 0 -b 1024 -i 131072", it should theoretically show you exactly how the drive was built and where the superblock copies are without damaging anything. I am hoping someone who knows this (and is not just guessing and theorizing like I am) will confirm this.

After that, you should be able to take one of the other superblock copies that are displayed by the above command and run an "fsck -b <superblocknumber> -fay /dev/hda4" to use the alternative superblock.