You don't have to use magnetism or electrical charge to store data. It can be done using light, or more rather, the reflection of it. Okay, if you want to be really specific, it's done using the interference of infrared and visible electromagnetic waves, but let's not worry too much about that!
Sometimes it pays to buy slightly older devices in place of tempting deals on newly released tech. But that approach to buying electronics can only take you so far. As today's gadgets become ever more powerful and multi-purpose, there are some product categories that are nearing outright extinction and would make for silly purchases. Before you consider buying any of the items on this list, think long and hard about whether such a device is not a waste of your money.