The Cybook is quite peculiar when it comes to USB connections. It always works but you might need to change the ports.
Under Windows you also quite often get an error message telling you that the file "reader.exe" is damaged and that you should run checkdisk to verify that all is ok (and other error messages regarding the integrity if the USB drive).
Of the USB devices I have used this is definitely the most sensitive, but all in all it works out (there is an issue with bookmarks etc disappearing but I am not sure whether this is a connected issue).
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