Does taking out your hard drive seriously void your warranty on a Macbook? That sounds, uh... completely insane relative to the practices of every other PC manufacturer.
WARNING: Apple recommends that you have an Apple-certified technician install replacement drives and memory. Consult the service and support information that came with your computer for information about how to contact Apple for service. If you attempt to install a replacement drive or memory and damage your equipment, such damage is not covered by the limited warranty on your computer.