Thanks for your help.
Unfortunately it did not work. It hid the directory "books" in the operating system. But it also hid it when I was trying to open the directory from Cool Reader.
I then renamed the directory on the sd card to .books. And when I closed out of Cool Reader, which forces a reboot (not reset), the scanning process started (and is taking a long long time). I only have books in the .books directory so it could only be scanning for that.
So in summary, it hid directory named books from both nickel and Cool Reader. But renaming the directory to .books still seemed to trigger a scan for importing content on a boot up. Firmware I am on is the latest - 4.18.13737
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