External hard drive has failed, but I don't think it's dead.

[Feek]

I grabbed my WD Mybook thingie from the Xbox and dragged it up here to put some media on it, plugged it in, deleted some stuff I didn't want and then went to empty the trash.

It started deleting but seemed to sit there for ages, in the meantime I copied the file on I wanted but the delete was still happening.

I ended up forcing a restart on Finder and then rebooting the computer.

Now it won't recognise that the external drive is readable at all. I get a message saying it doesn't recognise it. Disk Utility sometimes sees that it's there but not every time.

Tried plugging it into a PC but because the drive is formatted as Mac OS Extended, it doesn't even see it attached.

Any suggestions? I'm not happy if this drive is corrupted, it's got all of CSI (all versions), Doctor Who, Black Books, all of Enterprise and a load of HD movies on it. Of course, as it's just media none of it is backed up.