The Samsung I was using as my main disk gave out. SMART registered bad, but I couldn't get a replacement and copy the entire drive before the drive just stopped being detected by the BIOS all together. I was able to save a few things, but there's still a lot on it that I'd really like to recover.
You won't be able to fix the head if that is what went bad. If the drive will not spin up and run, your only real hope is a data recovery service. It is expensive, and not a guarantee. This is why backups are important - even if there are no issues.