Read about it here.

There rae so many different ways to bypass passwords it's absurd. However, it should be stressed by those who may have just briefly glimpsed at the article that this requires physical access to a local machine. This is not remote based so don't start unplugging your machines at home.

I dont really see this as too big of a deal. Like Interceptor said someone has to be able to physically be able to use your computer in order to do this, so if they can do that much chances are they could probably do all that stuff without the disk right?