So the other day I wanted to use my external hard drive for the first time in a few weeks, but when I plugged it in my PC nothing happened. So i tried plugging it in my MBP without getting any response whatsoever. Being in a bit of a hurry that day I didn't think too much about it and went out the door. When I got home later that night I tried to plug it in to my PC and it connected alright, but when I tried to store some files on it went "Not responding" on me. Afterwards I tried plugging it in to my MPB again, and got an error sounding something like: "Mac can't read the device you've plugged in" (my OS X is in danish, so I figured it's something like that). I'm assuming it's a software problem, even though it makes some weird noises from time to time. But the problem is that I'm having a hard time recovering my data because it isn't always responding as much as i'd like. Since I don't know too much about hard drives, software and stuff like that, I was wondering whether formatting it will fix my problem, and would I be able to retrieve the data I've lost afterwards? - I was thing something along the lines of a recovery tool, but would it work?