I have two terrabytes in my PC. The main drive and a slave drive. They are formatted into 500GB partitions. I have had drives last for years, and then some that died in 6 months. Back up to DVD and an external drive. All my Poser runtimes are on a 500 GB external so I can change from my desktop to my laptop with ease. External drives have saved me many times. Graphics, music and movies take up a LOT of space. I bought the Western Digital green SATA drives that run really cool as I had a heat problem intially as my CPU throws a lot of heat. 6400+ AMD dual processor and so does my graphics card. The drives really lowered the temperatures. High temperatures can really wreck your hard drives.