My cube came with a 20 GB Maxtor. It was totally silent. Replaced it with a Seagate Barracuda and it has an annoyingly loud hum that I have begrudgingly accepted. If I tilt the cube back at 45 degree angle and lean it on the wall (to get it off the desk) then it the hum is mitigated. Next I for a backup drive, I bought an external Western Digital 120 GB which was quieter than the Seagate, but still somewhat noisy. My newest acquisition is a 250 GB MAXTOR which is also virtually silent. Amazing! End of story. Tom Kuhn As we "YO" we Grow tomkuhn.com