What does Knoppix can do for me if i want to recover data on a hard drive that is badly damage, meaning that the MBR is totally screwed up and the drive has been formated.

Is there by any chance a possibility that i can recover some data on the drive or i'm i going to a dead end?

Thanks for your time

Note: If i can recover data, can you direct me to a good but simple tutorial on how to use Knoppix to do it...... Thanks