Western Digital My Book Premium 500GB USB/FW 400 Ext Hard Drive
Does just what it's supposed to.
We're using this to hold our music collection for iTunes with our old Mac G4 tower, and transfer of files and accessibility was (and is) fast and smooth. Yes, you do have to format the drive for Mac OS using Disk Utility in the Utilities folder, and the lame backup software that this comes with isn't Mac compatible, but Backup by Apple is a far more elegant solution, anyways! Don't hesitate if you need a lot of storage, and don't be discouraged because some of it's 'features' are just sales gimmicks. This hard drive is quiet, sleeps when it's supposed to, and is fast enough for most applications.