Anything in a .sdr folder is not a book.
The file extensions .mbp1 and .mbs specifically are the annotations files for the corresponding book.
.sdr is the sidecar folder, where "book.mobi" (or .prc/.azw/.azw3) matches up to "book.sdr" -- the contents of this folder are annotations (.azw3r and .azw3f for AZW3 books) as well as, for purcased books, APNX (pagenumbers) and .asc files for EndActions, X-ray, and Author details.
When you delete a sideloaded book, these are not deleted, as Amazon does not wish you to lose your notes.
That is what you are seeing.
Last edited by eschwartz; 05-19-2014 at 05:14 PM.
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