WD's VelociRaptor 1TB might be the fastest hard drive in the world, but it could also be the loudest. The new Scorpio Blue 500GB is a different kind of drive, a single-platter notebook model with ultra-low acoustics.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips