My 500GB startup disk is filling up, and i'd like to replace it with a 1TB drive. Hitachi has an enterprise class 1TB drive for $197, and a "lesser" 1TB drive for $89. What's the difference? Is the enterprise class worth the difference in price? http://eshop.macsales.com/item/Hitachi/0A38016/ http://eshop.macsales.com/item/Hitachi/0A35772/ Also, any other recommendations for other models/companies? Edit: I notice that Seagate has a 1.5TB drive for $147. It's a 7200.11. I remember that the 7200.9 drives had a firmware clash issue with the mac pro. Has that issue been fixed? Do the latest seagate drives run at full speed in the Mac Pros? I think i'll go with the Seagate drive if that's the case. Edit 2: There's also a Seagate 7200.12 available from newegg. I don't know what to choose! Hitachi enterprise class? Seagate 7200.11? Seagate 7200.12? Seagate ES-2? Currently I have a 500GB Maxtor w/16mb cache as my startup disk and other than the capacity, I have no complaints. Which drive should I get?