After running this rig for almost a year now, my Samsung Spinpoint 250GB is approaching 50% free space. I still have my previous Samsung, a 120GB sat in the tower though un-hooked... I'm wondering how I would go about adding the 120 GB, considering that it's got a previous copy of XP on, I'm unsure if the two drives would conflict and one or both would screw over and corrupt. Would it be possible to look through my old HD, retrieve any files, wipe and then hook it back in? 

