Flash memory manufacturer SanDisk Corp. recently added its second flash-based MP3 player to the market, the Sansa e100 series. About the width of four AA batteries, and not much taller, the two initial models come with modest 512MB or 1GB memory and a digital FM tuner. But what makes the line interesting is that capacity can be expanded by plugging in an SD card, which could add another 2GB of storage.
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