Your hard disk drive is a black box in more meanings than one. Wouldn’t it be pleasant to be able to directly visualize its contents? That is the core of the following proposal: an external hard disc drive whose surface is covered by an OLED screen used to display a treemap contents like it’s done by SequoiaView (see the example here showing the contents of a large disc drive containing hundreds of small files and a few bigger masses).
The display is slightly different, but takes advantage of the same principles and gives you a direct perception of the internal status of your storage media. It reminded me (in a more practical way) the slightly silly proposal I saw a few weeks ago, of a USB key chain that would physically inflate as you fill it with data.