New build, new bee. I know that I will buy two raptors in raid0 and one WD 750 for storage. The dumb question, most of the cases have only two slots that are 3.5 Because this is my first build, do I need 3 slots that are size 3.5? Bare with me, before I reseach it, is my Sata dvd burner a 5.25? An external 5.25 means you can access it like openning your cd drive? Are all internal HDs 3.5? Thanks for your patience.