Loud and fast motor on MacBook Pro

My 3 yr old MacBook Pro with a lot of hard drive room occasionally runs with a loud sound as if a motor is running fast.  Any ideas what that is?

The noise makers on a MBP are the fans, HDD and the DVD drive.  You can also run an Apple Hardware Test:
http://support.apple.com/kb/ht1509
Make certain that you have your data backed up.
Ciao.

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