If the hard drive is making any noticeable noises other than this chatter, including clicks and clanks, then you should back up all data on it (including all partitions, such as Boot Camp) and consider replacing the drive.
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If you start noticing degraded computer performance with high levels of this chattering noise, then you probably either have a relatively full hard drive or have run out of RAM for the applications you are using. In normal use the drive will make a mild chattering and grinding sound, that is usually intermittent but which depends on the task being performed. Perhaps the most common variable sound heard from computers is the hard drive. The folks over at PowerBookMedic have a small how-to on doing this for Apple's keyboards, but keep in mind that this procedure may be specific for a given keyboard model before attempting to try it. In extreme cases you can pry up the keys from the scissor arms they rest on and clean the button and hinge assemblies, but this can break the keyboard if you are not careful. Usually this just requires cleaning or other clearing of the obstruction, which can be done by using compressed air to clean the keyboard. If there is any odd binding or obstruction in a key on your keyboard or mouse, the key may squeak or make a mild crunching sound when depressed. One of the most annoying sounds a computer can make is when there is a problem with an input button or device.
Most of the time these noises are harmless however, there are times when you should consider addressing them. These can be anything from clicks to buzzes, to small squeaks that happen either continuously, intermittently, or in response to various tasks you may be performing on the system. At times you may notice odd sounds coming from your computer.
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