I have an "early 2008" MBP with the BTO 200GB 7200rpm HDD and I am planning to upgrade to a 320GB 7200rpm HDD, so I did a little research beforehand. It found out that Apple shipped my MBP with the Hitachi 7K200 drive with 200GB capacity. The Hitachi HTS722020K9SA00 model to be specific (as I can tell from my System Profiler app). As you can see here that specific model of the 7K200 has a SATA 1.5 Gb/sec Interface as oposed to the HTS722020K9A300 witch is exactly the same in every aspect, accept it has a SATA 3 Gb/sec Interface. Now, the 7K320, the new generation of the Hitachi 7200rpm drives with capacities up to 320GB (this is the drive witch I can only assume is in the new MBP's) also comes in a SATA 1.5 Gb/sec Interface model (the HTS723232L9SA61) and a SATA 3 Gb/sec Interface model (the HTS723232L9A360) (not counting the EA Models). As can be seen here the 2 different models of the 7K320, as where the 2 different models of the 7K200, are exactly the same in every aspect except in Interface (transfer rate 150 MB/sec versus transfer rate 300 MB/sec). Obviously I am going to purchase the faster HTS723232L9A360 model with the SATA 3 Gb/sec Interface (300 MB/sec transfer rate). I mean, why wouldn't I? So should every one else who is planning to get the Hitachi 7K320. Marginal higher costs aside, why wouldn't you? Getting back to my topic title, one question still lingers. Can anyone who got the 320GB 7200rpm option with their unibody MBP tell us whether Apple is shipping the Hitachi HTS723232L9A360 with the SATA 3 Gb/sec Interface or the Hitachi HTS723232L9SA61 with the SATA 1.5 Gb/sec Interface? You can look up your HDD model by opening the System Profiler app in your Utilities folder and looking under Serial-ATA / Model.