On 2011-07-19 15:15 , Dinse, Gregg (NIH/NIEHS) [E] wrote:
I have a Mac Pro that is making an odd clicking sound, which I assume is coming 
from either a hard drive or a DVD drive.  It seems to make noise for a few 
seconds and then is quiet for about 10 minutes.

it could be a drive, in which case it's hard to say if it's a worry; i'd make sure your backup system is in order ...

it could also be that you recently installed an app or service which periodically polls the hard drives
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