I have a question about putting in a 3rd hard drive into my MDD. I've got 2 80GB hard drives in the two ATA/100 slots in the back of the computer. One of them is set to Master, and one to Slave. What do I set the third hard drive too when I put it in one of the front bays? And also, what kind of hard drives work in these other bays? I have a 10GB Ultra ATA/33 hard drive. Will that work? It says they're Ultra ATA/66 bays, does that mean ONLY ATA/66 hard drives will work?? Does that mean I can never put 4x 750GB hard drives in my computer?? Thanks.