I've had some problems with my old HDD in this powerbook (and it's replacement) with both of them failing. Bunnspecial suggested me to buy an SSD, so I did (an msata crucial 128gb), and I bought the IDE adapter off eBay. Finally, no more worrying about moving my Powerbook too much. No more worrying about no hard drive shock detector, either. No more worrying about what happened last time.