[PatNY]

There is a bug in the stock firmware for the HD and HD+ whereby side-loaded books in a subfolder inside of the "My Files" folder, either in internal or on the sd card, won't be deleted from the Nook's library view when the entire folder is deleted without first deleting the books themselves. A book thumbnail persists, and clicking on it merely brings up the option to add the book to the home screen. You can't delete this thumbnail or ghost book through normal means.

AFAIK, there is only one way to delete these ghost books ... Put the exact same books back into a new subfolder with the same name and in the same location that the previously deleted folder had. Then select all the books and delete them. After that, you can then delete the folder itself. Then go into library view and refresh the view. The ghost books will have disappeared.

If you don't have those same books anymore or you can't remember the name of the folder they were in before you deleted it, then you are out of luck, as I was. I had to reset my device to get rid of the over 1,000 "ghost" books that showed up in the Nook's library view. Even though I use Calibre Companion to manage the books on my Nook HD, and the bug doesn't impact that app, it was annoying me that so many ghost books showed up in the Nook's native library when they weren't actually on my device.

To avoid this problem, simply be sure to always delete the content of those subfolders first, instead of just deleting the entire folder.

--Pat