I ordered this drive to interface with Time Machine on my iMac. After an unfortunate experience with a Seagate external hard drive previously purchased for my other computer (a PC, which was hard to interface with the Seagate - the included software was NOT user friendly), I decided to try this iomega 1TB unit for the iMac. I was very pleasantly surprised! It doesn't come with many instructions, and now I see why - just plug it into the wall and the iMac, and it works with no further input required! The iMac (and Time Machine) immediately recognized the iomega drive, and asked me if this was the one I wanted to use Time Machine with. I said yes, and haven't had to touch it since! Quiet, automatic, and (so far) reliable.