Hello, I bought a MBP 15" past november. I chose the 160GB hard disk as I expected the higher bit density could improve its speed (given the fact that, unfortunately, a 7200 RPM drive was not a BTO option back then). However this drive makes me sick: it is extremely slow under moderate load and brigs the system to its knees (even though the CPU remains almost idle in those cases). The disk is really a bottleneck in this machine. (Yes, I do some intensive disk operations such as updating through CVS very large source trees... or starting Half-Life 2 ;-) which also takes ages.) I am planning to manually replace the disk with a 7200 RPM one and install the one I have in an external USB enclosure. I know the MBP's drive is not user-serviceable (such as the MB is), but is the process of replacing it very complex? I remember it was really hard in the iBooks. So far I have found the new Seagate Momentus 7200.2, which according to some reviews seems to be fairly good: speedy, draws a similar amount of power and heat to a 5400 disk and doesn't add too much noise. Any other better suggestion for a 7200RPM 2.5" hard disk? Has anyone tried them in a similar MBP? Will the "Motion sensor" keep working? I mean, is that sensor part of the drive or is it part of the laptop? Thank you!