Originally Posted by SCION
I experienced this issue once. Had to delete metadata.calibre and driveinfo.calibre from the Kobo. Perhaps I could have deleted only one, but since they both have calibre in the filename I deleted them both at once.
I tried deleting the driver and metadata file which didn't seem to cause any problems but when I plugged my Kobo in again Calibre put them back on automatically. It does this every time I load a book from Calibre after I've deleted them.