How many other drives do you have hooked up right now? If you only have 1 HD and 1 CD rom currently just set the jumper on the 80 gig to "slave" and hook it up. I'd attach it to the same cable as your other hard drive. Be sure to check the jumper settings on your main HD and make sure it is set to "Master" and not "Cable Select." (Or set both HD's to cable select, whatever turns you on)