Be warned when upgrading your HDD, I purchased a Western Digital 750GB 5400 Scorpio Blue. This HDD took twice as long to install game data. I had to switch to a 7200RPM Segate 500GB. Top get the same performance as the stock hitachi. Just remember that since our games are now on the HDD, a higher RPM will help in this case. The 7200RPM is a little faster than the stock HDD.