I haven't been using my PDN much because I still have several paper books I want to finish. But this morning I played around with it a bit (all on the PD_NOVEL volume -- the internal mSD card).For ebooks: I created several sub-folders for different authors in the "eBooks" folder. For one author I created another sub-folder for one of his series. I moved books into each sub-folder and then used the PDLibrary to see what happened. It recognized the sub-folders and the books but it but just listed them the same as if I had put them in the parent "eBooks" folder. The individual sub-folders weren't shown/listed so it was a waste of time.Then I created three (3) sub-folders in the "Photos" folder and moved some pix into each folder. I used the PDPhotoGallery to view them. It found and displayed all of them but Instead of three (3) albums to select and open, the viewer just listed all the photos alphabetically.