I had the same problem -"a disk read error occured" and the VW wouldn't boot.  I tried it a couple of times, tried dismounting and mounting, all sorts of things, but I couldn't get past the problem.  I just went back to my backup.  *shrug*.   If someone finds a resolution to this problem, I'm all ears, but for now I've got to say the product doesn't do what it says on the tin.