Just occasionally on the Internet you come across something that makes you think 'What hasn't anybody thought about it before?'

Today, it is Hitachi's page on dying hard drive sounds.

Yes, you read that right, a page devoted to the sounds that hard drives make before they finally die for good. Good engineers can tell when their machinery is going wrong by listening for it - good IT administrators can do the same. With this page, they now have a way of identifying what the problem is with a hard drive based on it's sound.