I just put a Seagate momentus 5400RPM ATA HDD 160GB into my laptop and it works good but I was on a car ride and everytime I would sleep the laptop, then wake it up, I would get back on, move the mouse/do work for 5 seconds then completely freeze. No response from mouse, keyboard, or caps lock light. I had to hard restart.
However it has been difficult to reproduce the problem. It has maybe happened 3-4 times in the last 2 weeks. I am going to try putting the old HDD back in for a little and see if it happens at all. I may just RMA this one in the mean time to be safe but I wouldn't mind some input.
I think the weirdest part is how I could operate for a few seconds before lockup.