ST3750640NS chirping?

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I'm running a long DST test on a 750GB drive I just got basically for free and it's occasionally making a chirping sounds when it seeks. I've found quite a few people mentioning their Seagate drives chirping, but not anything conclusive about this being a sign of drive failure. So far there have been no errors reported in Seatools. Is this something to worry about?

 

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Guess, I got my answer. bad sectors after three good long tests. damn and Seagate says the drive was an OEM drive, so the five year warranty is out.