Somebody stated previously (one othe Cambridge guys, I want to say) that they use very slow (read not-top-of-the-line) RPM drives because there's no point in getting the fast ones because the speed wouldn't be used. I expect that the drive in the PowerBook is top-of-the-line as far as RPM goes. (My experience with Apple tends to indicate that they don't skimp on this sort of area.) And given how heavily MacOSX swaps, it sounds like a reasonable assumption. Given that he's opened both products, he can certainly give both drives a look-see. I could be wrong; it's just a guess.