One other remark because I notice some musinderstanding:
Formatting an SD Card on the PC is not making the SD Card recognized by SDExplorer
and error: can not open KN7000 file structure H:\: Access is denied." pops up.
But when you put this card into the KN7 you won't see folders and song info.

Please try the following: Insert you SDCard in the Reader, Cancel the optional pop-up window.
Now initiolize the SD Card via the Start menu (Start... KN7000 SDExplorer...Initialize KN7000 SD Card)

Now try again opening SDExplorer. You should have the program started with empty folder and song panes. Now you can 'build up' the SD Card via importing songs, creating/importing folders, etc.
Another way to handle a new SD Card or Windows formatted card: restore an sdb to the Card.

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Kind Regards, Fred