1. What does it do 2. How do i do it Geeksquad checked my laptop and said everything is fine even the hd, but he says i should zero it out. I aint paying 120 bucks for them to do it, so OT help me out. I has a gateway t-1620 btw. The reason why im doing this is because my laptop is so fucking slow compared to when i bought it. 2 gigs of ram and is acting like a piece of shit.