Hanvon WISEreader N618 User Manual page 35

Select "Removable disk" under "My computer" to
remove, copy or delete files or folders from the
device.
There are several pre-loaded folders on the Micro SD
card: e_audio, e_book, e_image. Save audio, ebook,
and image files in their corresponding folders. Notes
and Memos created using the device will be saved in
the "e_notepad" and "e_note" folders respectively.
Note: these pre-loaded folders can't be renamed or
deleted. Please save the files in the correct folder,
otherwise, the files cannot be opened. For example,
save TXT, HTXT, PDF, EPUB, DOC, HTML files into
"e_book", save pictures into "e_image" and save
music into "e_audio."