|What does this have to do with CPU OR Overclocking?|
Post this under hardware or under XP forums.
Include your FULL question in the text body, the Title is only for a brief glimpse into what the question will be about.
Include your machine's make and model number.
LOOK inside your machine and report IF there is a hard drive mount for more than one hard drive (some cheaper models only have a single mount).
LOOK inside your machine to see what interface you have (SATA or EIDE) AND how many connections you currently have.
If you do not recognize the type of connection or how many available ports you have, then take the machine into a shop where you would purchase these and they will gladly tell you what you can use, how many you can use, sell them to you, AND far a small additional fee. install them and set them up for you (be specific on how you will use them and how you want them to format them for you.
You have to be a little bit crazy to keep you from going insane.