The new $50 Amazon Fire tablet is not only economical in price but is the first one to have an SDXC card slot. This will allow users to upgrade their storage up to 128 GB to store multimedia content, but forget about e-books. Amazon is preventing users from being able to load their own e-books on the SD card from other bookstores or downloaded from the internet.
The SD card is one of the Kindle Fires most compelling feature, and this is the first Amazon branded tablet to include it. Many users have reported to Good e-Reader that the Kindle e-reading app will not recognize e-books in the MOBI, AZW or KF8 when loaded on the SD card. This means that you cannot sideload in your own content because the Amazon App Store does not have any 3rd party e-reading apps to read Kindle books or anything that will read EPUB.