I used partition panager (under windows) to resize a fat32 partition on my external hard drive in order to create a boot partition to install linux. For some unknown reason, the computer freezed during the operation (hd idle, mouse not moving, keyboard out of order...), so I had to reboot. Foolishly, I hadn't created partition manager's recovery cdrom, so I booted into windows again and run partition manager again and altough it detected the abnormal termination, it seems that it didn't finish the operation. I used chkdsk to fix partition errors and all I got is files in the format filexxxx.chk
Now my question. I had some iso images in there that I want to recover. (I had lots of other files too, but I have kept a backup of the most important ones and I don't care about the others). I tried mounting some big chk files (600+ MB), as most of the iso images were of this size. I used
mount -t iso9660 filexxxx.chk /mnt/image -o loop,ro
However, mount doesn't work and dmsg|tail says
Unable to identify CD-ROM format.
So, is it possible to recover those isos (or at least some of them)?