Disk load error

I'm posting this for a friend who's just bought a Hog 2, so may not have all the details...

Loaded a basic patch into his Hog, saved regularly during the programming session. At one point got the programming wrong so went to go back to a previous version from disk. None of the 4 disks he'd saved (4 copies made at the same time) would re-load into the desk. All had the same fault - couldn't read the fixture schedule file, so load abandoned. Also gave an error box : "The file is incompatible with this version of the software". This fault also then showed up when he tried the patch disk that he'd started from.
He went for lunch, came back and the desk loaded the patch disk, but still wouldn't load any of the saved programming.

Any ideas?

Thanks
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