John, Robin, The Western Digital Scorpio Drive 2/5 inch is a SATA drive 120 GB fast performance, low power consumption, very quiet (according to their website). Although I have never personally used a Western Digital Drive, I know it is the replacement drive of choice of our local junior college IT department and of most of the teachers there who have a preference. Another thought about Seagate drives: they have begun implementing a new way to align information on harddrives that is supposed to increase the amount of data stored on a disk. I imagine drive sizes will increase soon. And they are pushing the SATA format in their server drives, they may also have SATA drives showing up in their mobile line soon. Paula John writes <<No it will not! I have a Titanium that I put the 160Gig drive into. But the new MacBook Pro's use a SATA drive, not an ATA-6 drive. So the new 160Gigs won't work. :-( Otherwise I could just transplant this drive, but the interface is different. At least not for now. And yes, the power drain is substantial. John >>