I am finally ready to buy a Drobo (4-bay USB2/FW) for my Mac mini media center (bouncing back and forth b/w plex and boxee, but that is another forum post). I know that I want WD Caviar Green drives. I don't know whether I want the older EADS or the newer advanced format EARS drives. The newer ones are cheaper (for the price of 1 TB EADS drives I can get 1.5 TB EARS drives). I know that the EARS require the newest Drobo firmware updates, and that the EARS don't play well with Windows XP. I cannot imagine using this with XP (although, the Drobo will stream content to Macs all over the house). Which drives are better. Should I spend a little extra to get the older EADS because they work, or are the EARS actually better for OS X?