I have an external drive hooked to my iMac 5. I had an icon on the desktop for it. Yesterday I was woking on Imovie and I wanted to add a file from the external drive to a movie i was doing. I cliecked on the drive's icon and dragged it to the Imovie library. i started to hear hard drive noise for a while. The next time I turned on the computer, the icon for the external drive was no longer there. Can anyone tell me how to find it. Thanks.