I have been a convert to the Mac system for a couple of years now, however I have hit a problem. When I bought my imac I invested in a Iomega minimax 500 gb hard drive to compliment my system and provide a time machine archive. All has been good until now. The drive doesn't appear on my desktop and time machine say's I don't have a drive connected, yet its powered up and wizzing. I have tried changing usb ports and cables yet nothing. The only thing that see's it is the disk utility, yet that wont repair or do anything to it. Is this a systematic failure of the drive or is there anything else I can do.