Thanks, davodfor, I'll try them one by one.
Finally, I had to reformat the SD card (after having backed up the reader using CCC) and restore the backup.
Now, there are no longer error messages, but it takes half an eternity for the reader to be recognized by the computer and by Calibre.
Last edited by Maida; 01-20-2018 at 05:08 AM.
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