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Sideloading books onto your NOOK Tablet, NOOK Color, or NOOK with Calibre is fast and easy. After you connect your NOOK to your computer, Calibre detects it and displays an icon for it in the area directly under the toolbar. If you have a microSD card installed in your NOOK Tablet, NOOK Color, or NOOK, Calibre displays an icon for both your NOOK Color or NOOK Tablet and the microSD card.
When you connect your NOOK Tablet, NOOK Color, or NOOK to a Windows computer, Windows assigns drive letters to your NOOK Color or NOOK Tablet and to the microSD card if one is installed. Calibre assumes that the first drive letter assigned to your NOOK Color or NOOK Tablet is its main memory and the second drive letter is the microSD card. However, sometimes Windows assigns the first drive letter to the microSD card; when it does that, Calibre incorrectly identifies your NOOK Tablet or NOOK Color’s main memory and the memory card.