I am building my first new PC and I bought a 160GB SATA drive. My old PC has a 40GB IDE drive. I'd like to install the old drive in the new computer as a second drive. Obviously it has the OS on it because it was the only drive in my old system. Is it better to use the old drive as the boot drive for the new system and use the new drive for everything else? Or is it better to let the new drive be the boot drive and just use the old drive for secondary storage? If I use the new drive as the main drive, how do I deal with having the OS on the old drive. Will the computer ignore it? Thanks.