Hi howdypda and thanks for sharing.
Correct me if I'm wrong: PRS recollect does not support subfolders, eg:
Code:
SD root
-Sony Reader
-database
cache.xml
-books
-collectionname1
book1.pdf
-collectionname11
book11.epub
book12.lrf
-collectionname2
book2.epub
book3.txt
(etc)