These days, solid-state-memories are available in all shapes and sizes. It is becoming more and more difficult to keep up-to-date with all the different properties, advantages and disadvantages of the many types of memory modules. Reason enough, therefore, to devote an article to these.In the last few years, the appearance of new electronic products on the market has been ever increasing. The movie camera has already lost the battle with the electronic version, still cameras are being replaced with digital models and even the humble diary is being threatened by the pen-computer. All these products have to store their information (photos, appointments) somewhere, preferably on a media without moving parts or batteries. For this purpose, manufacturers have designed memory modules with a large quantity of non-volatile memory elements. Just as has happened with many other products in the past, manufacturers have not been able to limit themselves to a single worldwide standard. Therefore, we now encounter various types that are (solely on different dimensions alone) not mutually interchangeable.