Then you heard wrong. A slower CPU will take longer to format a larger drive, but I wouldn't let that stop you. I'd get the best performing drive you can that has lots of space. Obsidian pointed out a couple of good ones. As for Cache, latency, rotation speed, etc, your worrying about this to much. The Seagate 7200.12 and WD AAJS(?) drives are fine. Don't worry about 7200RPM vs 10000, or 16mb cache vs 32, etc. Find a 7200.12, AAJS, or F3 drive that you can afford and be happy.