Currently Being ModeratedMar 11, 2013 11:26 AM (in response to one idea....)
I ran Data Rescue 3 by Prosoft and it returned the following graph:
In case you can't see the stats, that green spike is up to 30,000 msec in readtime for the HD. The smaller spikes before and after it are at about 2,000 - 3,000 msec. The threshold (red line) is a recommendation: persistant read times above the red line (about 1,000 msec) could indicate a problem with the HD according to the program. I guess it's time to see about replacing the HD.