I rarely use my SD slot.
But a fair number of members like it for a variety of reasons:
1. Long trips. A couple of years ago we had a photographer who was planning an extended trip to the Amazon delta, and wanted to take his library with him. Some people in the military may also appreciate this possibility, especially if they want to travel light.
2. Some people want to have a completely free choice, so that when they finish a book they can start on anything else in their library immediately.
3. Others figure that if they can put their entire music library onto their IPods, then they should also be able to put their entire ebook library onto a card.
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