If You Hear This Sound, Panic

Via Engadget, we get some instructive audio files from Hitachi Corp:

My hard drive is experiencing some strange noises but I am unsure if the drive is failing. How can I determine if the noises are due to a failing hard drive?

There are various noises that may indicate a failing hard drive. If you are experiencing any of the noises, please contact the technical support center at: 888-426-5214.

I’ve heard one of these before: Bad Head #2 (WAV file) (insert cheap oral sex joke here). The sound was followed by my hard drive coughing up some blood, asking for some whiskey and bleeding out.