If you're using Calibre to load them onto the card, you might want to go to Preferences -> Sending Books to Devices and then change the "Save template" text string to (without quotes) "{author_sort[0]}/{id}". That will send them into directories on the device, ordered by the first letter of the first listed author's last name, and turns the filename into a number, for example "4391.epub". Apparently this solved the error for some people (at least the corruption that seems to have been caused by filenames with underscores and other special characters in them).
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