In my post above, I mentioned that I have two 160GB Seagate ST3160023A drives in separate computers.
One of these drives has 4.2 years (~37,000hrs) on it and the other has about 3.8 years (34,000hrs) on it. Both drives have run flawlessly with zero bad sectors, but I'm wondering if I should retire these drives. I'm wondering if I'm on borrowed time with them. They have both been the best drives I've had, and I'm convinced the 7200.7 models of Seagates were some of the best drives of their times.
Would anyone replace them with the hours they have on them, or simply keep running them? I do have a few 80GB drives with far less hours put on them sitting on my desk.