Apple Hard Drive Update

I recently got a mac, and am just slowly starting to get used to it. One thing I noticed the other day was funny 'chirping' noises coming from my mac, and the hard drive would seem to write like crazy.. I thought it was just 'something wierd', but I wasn't the only one. Now Apple have released an update that is supposed to fix the issue. Just needed a reboot, let the firmware install, it shuts your computer down, power it back up and your up and running again. So far so good.