Peter Hofmann fixed his drives and documented the whole process on his blog:
After about a day of trial and error, I finally fixed my drives. To save anyone else the days worth of effort, I’ve documented my solution here:
Firstly you need to go and find a tool called HDAT2 from www.hdat2.com download it and create a boot disk for it.
Then a tool called MHDD is needed but you need to inject the bootable ISO with some script files from the above hddguru address. Problem is, this is quite difficult and requires a floppy drive, or a virtual floppy drive which turns out is quite difficult to use on a 64 bit machine. Virtualbox and 32bit windows XP to the rescue. After a fair bit of futzing around I finally ended up with a final ISO file that can be burned and booted – the hddguru post doesn’t say exactly where one of the bin files needs to go so I had to guess around a bit before getting it right. Get the bootable ISO from here dl.dropboxusercontent.com
If you want to make your own, then just remember that PUIS goies in the scripts dir and off.bin goes into the dir above that