I have an Acomdata 250 gig portable hard drive that I was using to put movies on, yesterday it just stopped working in the middle of copying a movie. I was using handbrake and the HDD was set as the output folder, no message or anything popped up other then handbrake saying my encoding was done. I thought that it went to fast so I went to open the HDD to check and see if the whole movie was copied and it was not on my desktop. It was still plugged in and the light on the HDD was still lit up, but it was no where to be found on the computer. I have tried hooking the HDD up to other computers and it will not work on any of them, the light comes on and you can feel that the drive is running but it does not show up on the computers. I can't even get the hard drive to show up anywhere so that I can reset it or reformat it. any help is appreciated, also I am on a macbook, 2.16 GHz, 2 GB ram.