Disk Insertion error

I have a WB 500 GB external hard drive that has stuff on it I'd rather not delete if I can help it.

I'm having disk insertion errors, when I plug it in it says "The disk you inserted was not readable by this computer" and i can initialize, ignore, or eject. In disk utility, none of the repair options are available, everything is greyed out. No matter what I do the icon doesn't show up on the desktop or anywhere else.

I tried to see if it worked on a pc but it doesn't show up in my computer. On the pc if I go to safely remove hardware it shows up as a USB mass storage device, and according to the properties it is working properly and everything, and I've reinstalled the drivers and nothing happened.

I've tried Disk Warrior but it didn't even recognize it.
HELP!

This has never happened and I've used it on macs and pc's before so I don't know what caused it.

Thanks in advance.

Firstly download the demo of Data Rescue to see if there is a chance of getting files off that disk

http://www.prosofteng.com/downloads/

I just did and it says no files were found on it!!!
How could they have deleted themselves?? I didn't do anything!

Is it possible they are still there or should I just reformat and erase the drive?

Get a second opinion with Boomerang

If you get no luck you may be stuck I'm afraid, sorry

http://www.boomdrs.com/macosx/