Let me emphasize what Sirtel said, DO NOT unplug the ereader from the PC too soon!
My PC shows a pop-up stating that it is safe to unplug the device. IT IS WRONG!!! Watch the ereader carefully. My Kobo allows me to check that the new books are accessible on the reader. Only then do I unplug it. I don't know if the NOOK will let you do that.
Unplugging the ereader while it is still transferring data will corrupt the database, and then things get messy.
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