CRAIGINBMINOR A week ago, my entire G-Tech hard drive (20,000+ iTunes songs) stopped mounting. The entire thing was finished. DiskWarrior couldn't even find it!
Then I found Data Rescue, which picked up the device, scanned my files, located them ALL (WITH ORIGINAL NAMES!) and recovered them. This company is absolutely fantastic; their customer service is A+ as well -- almost instant responses.
If ANYTHING happens to your HD, go with Data Rescue II.
(Version 1.2.1)