Please move as needed. How are 2 hard drives set up in the same tower so that both are used as storage devices? One to hold the OS and programs, downloaded software, and the other for mostly downloaded software and temp downloads. In other words 2 40 gigs acting as if it were one 80 gig. When I download does a dialog appeare every time asking which hdd I wish to use? One or Two? E or F? Is c drive used first until full, then F drive is used until it is full? Then I can erace selected data on either or both to reclaim space? In my case an 80 gig is enough. I have never filled one. I have 2 40 gigs and parts to build another functional tower. It will be equal to a dell dimension 8100 or an optiplex gx 400 depending on which board I use.