On the PocketBook you have a regular file system structure, like on a ftpserver or any filesystem.
Also you have different ways to sort 'em like in the most file-explorers.
They can be created like on any other HDD/SD-Card/USB-Stick. The Menu "Books" will list all readable files in this folder, when you explore to a folder or to the rootdir.
Even if you have on SD and Internal-memory the same foldernames, PocketBook can handle em, it will display a symbol for SD and for internal-memory aside the folder. (Same procedure for same files in same dir)
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