I will be buying an iBook shortly, and need at least 80 gigs of space (I'm an amateur photographer and a student, so I need the space). I'm stuck between the 12" and 14" at the moment. You can upgrade a 12" iBook to an 80 gig drive for $90 w/student discounts. This would give me an 80 gig 4200 RPM drive. However, on Newegg, you can buy an 80 gig 5400 RPM Laptop drive for around $100 (http://www.newegg.com/Product/Product.asp?Item=N82E16822149020). Now, I certainly could use the speed bump of a 5400 RPM drive when I'm loading up and transferring large JPEG and RAW files, so I'd love the 5400 RPM drive. What technical difficulties, if any, can I expect to encounter if I choose to install this drive? Should it just be as simple as popping out the old drive, popping in the new one, and reinstalling the OS and other software? Will this have any effect on the new Apple Sudden Motion Sensor's ability to park the HD heads? What about my warranty? Thanks in advance for your answers.