What is your favorite disk recovery program and why?

I am specifically looking for disk recovery programs that could possibly run and recover after a physical error to the hard drive (in theory) Thanks!

Answers:

There's a plethora of them I've tried. The best ones are:

Final Data 2.0
GetDataBack
MediaRecover Advanced
MediaRescue professional
PC Inspector Smart Recovery

Then there's Ontrack's Easy Recovery professional (best one)