Memory Cards
Computers don't have a monopoly on memory. Today's high-tech toys such as MP3 players and digital cameras also need memory for storing their software—the music you play on your MP3 player and the pictures you take with your digital camera.
The requirements for this memory differs from that you install in your computer. Although you want computer memory to be as fast as possible, speed is not as important as permanence for other electronics. You want your music and pictures to always be there when you want them, not subject to the vagaries of your batteries or utility electricity supply. In a word, cameras and MP3 players want nonvolatile memory.
In addition, you want to be able to quickly add to or exchange the contents of the memory ...
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