Hi Mike.
From your description of the noise, and the fact that it happens during disc intensive operations it looks as if the drive is on the way to the scrapper. Go to the manufacturers website, and grab the diagnostics program. How old is this drive, as most makers give a three year warranty, and you may be able to get a replacement. Again, check on the website for details.
David




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What kind of drive is it? (Curious)

