So my PB has been acting very strange lately, well actually, acting strange for the last 2 months. Constant freezes with beachballs, a hard drive that sounds like it is constantly accessing when I'm doing anything. Hard drive buzzes when I tilt my PB. Over a year old, no Apple Care, so I am probably going to spring for a newer, larger, faster HD. Do I head back to my reseller for a PB compatible HD or can I buy one off a store that sells PC parts? Which hard drives are good? First time buyer of 2.5" HDs. I guess this is bad for me. Attachment included.