I have 2 Seagate 7200 Hard Drives installed(you already know Opus!) One is a 13 gig with my OS and Apps The second one is a 20 gig for samples,sound files ect. Rather than replacing one with a larger HD, I thought of just adding one more. Therefore, I could have one for the OS. Second for sound samples and Ghost image and the 3rd would be for sound/video files. What do you think???