Could be a sign of impending disk crash, or, it could be the fan. One way to check is open the notebook to a 90 degree angle, and CAREFULLY rest the computer on one side, then use a sewing needle or tooth pick to stop the cooling fan, momentarily (about 2 seconds or so). if the noise subsides, then the fan is the culprit. If not, then back up your data, and get ready to replace your hard drive
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