I've become a bit frustrated lately at the speed of my MacBook (this may have something to do with the 10.4.10 update, but I haven't wanted to go to the trouble of reinstalling 10.4.6 from the DVD and then bringing it back to 10.4.9). The hard disk in my MacBook is a Toshiba 80 GB drive at 5400 RPM. It was actually a replacement for the original drive -- Apple changed it out when they replaced my battery for a charging issue. I know that tight enclosures make for significant heat buildup, and the price per GB of laptop hard disks isn't that great, so I was thinking that getting an external FireWire hard disk would be a better bet. Does anyone have any experience using an external hard disk (say, 7200 RPM) over FireWire as a primary boot disk? How is the performance? Does the MacBook run any cooler? I'm also curious as to where to get a good quality drive at a decent price. The specials at Staples, Circuit City, CompUSA, and the like tend to be USB 2.0 drives -- not the best for regular booting. Would it be wise to buy a good FireWire enclosure online and then buy an internal drive on special?