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How conversant are you in information technology? First the SD card comes in two different varieties: SD and SDHC, he additional HC stands for high capacity, all ereaders are configured to read SDHC format. SDHC comes in a variety of sizes ranging from 1gb to 16gb these days are are also clasified according to class the higher the class number the faster the card is. Does your mother like to save the books on the card for future use or will she be deleting the ones that she has read? If she will be deleting then a 8gb should do it, but if she is a pack rat like me then the 16gb or perhaps 32gb will be needed.
The books themselves come in a variety of different formats of which the two major ones are PDF and epub. You will need to check with the manual to see which formats your reader can support. If you intend to get PDFs then you will be forced to get them from B&N, not a big restriction. If you get epub you can get them from just about anywhere you want. The library books you will need to make sure that they are in epub format. If you download a book from Amazon or Borders Books you will need to make sure that you buy them in epub format so that your reader can use them.
Cases for the readers are sold separately. Your mother should get in the habit of charging her reader when she goes to bed so that it will be ready for her to use in the morning.
This is a quick overview of what you will need to know.
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