I first tried by writing a small arborescence. A main directory, three sub-directories and I placed a dozen of books in each. Reasonable to start with, isn't it?
Then as I had this problem, I deleted all and restarted again. As this was not getting any better, I copied less and less books at every try. I ended with one file in the root of the card.
I reformatted the card several times to be sure. I never noticed anything wrong when copying from the PC.
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