You would be better off posting this in the Computer Help forum which you can find Here
Given that your PC can only boot from one drive at a time, you may want to clarify what it is that you mean by Work Together when you post over there
P
when you build your desktop pc and use hardware from another pc to build yours.my plans aare to put 2 harddrives in the case.given that they both have windows xp,but are from 2 different pc's,how do I get them to work together. I have no way to do a system restore on either pc.so please help me. Thank You dumb as can be