Just a quick question. I'm trying to build my second computer ever. Am still watching holiday sales etc. for the best deals over next month. So far the only thing bought is the p180 case . Considering q6600,p35 depending on market, must step up within 3 weeks video card. The question, if I install one sata hd for the o/s internal and install 2 removeable sata hd bays from previous build. Can I hot swap the storage drives or must I power down first? Also best recommendation for the o/s drive as this will be new. Off to work check back later, thanks in advance for your help.