Laptop hard drive

Just bought a brand new hp dv6-1245dx yesterday from best buy. One concern I have is the hard drive. It doesn't make the normal noise a hard drive makes when accessing data. Instead, it will click once. For example, when I load a new webpage I will a hear a click instead of the normal soft rumbling (don't know how else to describe that noise). It doesn't click repeatedly, just once. The computer seems to be running well, but I'm concerned that the hard drive might be faulty. Does anyone else with this laptop know if this is normal? Thanks for the help.