The HD on the MacBook can be changed out by loosening 3 screws.
I doubt this would be cause to void the warranty. Similarly, adding RAM is fine
Remember that a 7200 rpm drive will eat your power faster and that you will have no support from Apple until the machine is returned to its original specs.
Your warranty and support is based on the machines original specs and does not cover its performance with after-market add ons
I want to upgrade my aluminum macbook's 5400 RPM hard drive to a 7200 RPM hard drive.
My question is: Will upgrading the hard drive void the warranty on the new macbook?