Anand Tech reviews the largest hard drive yet. Hitachi is the first to the 400GB mark and currently, they are the only one to offer the drive size. So, if that's a requirement of yours, then there's no options to consider other than the 7K400. If this is a purchase that you must make today, there's nothing to complain about when it comes to the 7K400. Man, think of all the por...err, data you can hold on one of those things. I don't think I have 400GB between all the computers I own! Anyway, 400GB is yummy.