my hard drive only has 18gb space with nothing on it so i need to buy a new one, i was going for a 320gb one, but i dont know if it will fit and how to check if it will, i have and acer aspire 3610. http://www.dabs.com/products/seaga [...] s=52080000 thats the one im thinking of getting, i dont know if i need a 2.5inch or 3.5inch, please help