Well I haven't been having any problems but lately I've noticed sort of a pulsating hum. Honestly I thought it was a fan, I disconnected all the fans and the hum was still there; so I disconnected each hard drive and found that it was one of my hard drives making the pulsating hum. It's really quiet but it still concerns me. The hard drive in question is a Western Digital Caviar Black WD5001AALS 500GB drive. I have 2 other Seagates and neither of them are making any noise. Is the hard drive going bad? It is almost exactly a year old.