I suggest you delete one eBook in that directory and create a new directory and put more in it. It could be you ran out of space for creating more files/directories.
You get 65,534 files/directories entries. Every filename/directory name that's longer then 8.3 gets at least 2 entries. So anything with 17 characters in the filename gets 3 entries. So it could be that you have used up your directory space.
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