recently i formated my pc nd installed windows 7 and after that sometimes my hard disk getting load and whatever work i am doing that time even using internet or doing any work in pc get hanged for the moment and everything become normal after few min but at a time hard disk made sound as it trying to load something after making that sound 2-3times it'll become normal i just remove or fix again all cable of hard disk but its still the same need help should i do format again or some problem in hard disk