I've been reading a lot about an apparent noise the 100GB HDD have (I think they are Seagate). I'm sure some of you have seen the growing thread in the Apple Forum? http://firstname.lastname@example.orgY8aaN8Sfk.1121099@.68a61f5f I recall a similar incidence with the G3 iBooks having HDD that make this sound and the huge note of concern when they were released. Apparently it is an intermittent clicking or thunking sound much the same as a pencil being tapped on a desk (which is what the G3 iBook does in some models?). I'm sure it is just an aspect of this hard drive ??? I have a BTO PowerBook on order with such a HDD and was wondering if anyone who has a Rev D PowerBook with a 100GB drive has noticed this sound?