I don't try other card but when i connect my ebook to my computer (with a cable USB) this is like that :
https://image.noelshack.com/fichiers...68-ebook-1.png
So the CardReader work.
And when i look at the SD Card i have :
https://image.noelshack.com/fichiers...71-ebook-2.png
But when i place PDF or CBR inside it's not recognize by the ebook

I was thinking some things to do before the transfer, you know about that ?