Ok I got this cool refurb HP computer to run my cams with Blue Iris. So far the computer looks and works great for a sub 300.00. Unfortuantlty is uses this small form factor I have never seen. It's really about the weight of a large laptop and has no room to add drives. I purchased a 4gb WD Purple drive to use for video and planned to add it to this computer as a secondary drive. Well I have no room for it! I can either reimage the new drive with the OS and use it for both video and OS. The other option is keep the 750gb drive with the OS on it and use a external USB drive. Does Blue Iris run good on a WD purple drive if I use that for both the OS and Video? Or do you recommend having 2 drives?