Big hard drives are a crap shoot on the QS's. Stick with a 120 G drive. I have seen problems with drives over 128G on those machines. It will only recognize 128 of the 160, but it's not a good way to run.

I have seen where the big drives cause no problem, and some even format out to the full size, but I have also seen major data loss on some that only format to 128, so I recommend sticking with a 120.

Don't get a WD POS either, get a Seagate.