If you are wondering why your hard disk is always running out of space, it could be that you have stored (unknowingly) plenty of the same files in different names, folders and drives. While we all know that it is important to get rid of these unwanted duplicated files, it can be an arduous task to hunt them down and keep rid of them. Luckily, there is this tiny tool – Double Killer,  to make this task much easier.