Before running Calibre, open a command prompt and run the command chkdsk /r on the Kobo and see what happens.
A fastfat.sys error can be caused by an error on the Kobo.
Also, I've read that some with this error solved it by switching from a USB 2 port to a USB 3 port.
Last edited by JSWolf; 01-24-2017 at 04:39 PM.
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