I am currently running a WD Raptor as the only drive in my box. But, I have a WD 800JB ide hd that is not being used and I would like to include it as a slave drive to hold large files such as pictures and music. The 800JB has a full install of windows on it right now. I just unplugged it from my system when I received the raptor. My question is, do I have to format or clear the 800JB before I can run it as a slave for data storage? BTW both HDs are formated with ntfs and have win xp pro installed.