Both the hard disk drive and the mouse are important parts of a computer system, but neither is about giving you direct information on what is going on in the computer. Well, these interesting DataBot concepts developed by two German students do come up with the information. As the hard disk fills up, the roll of the mouse becomes slower, that gives you an idea of the size of the file as related to the rolling speed of the mouse. An additional “breathing” feature lets you know how frequently a file is used. On the other hand, the Hard Disk concept can expand and contract, depending upon the space being used.