We have been down this road before. While the 500 will (in theory) read up to a 4 GB Memory Stick (and up to a 2 GB SD card) the directory structure peaks out before the stick fills.
Given AprilHare's situation, there will be 210 book table of contents screens. The solution given a long time back for the 500 was to get a number of smaller (read cheap) SD cards or Memory Sticks and segment the books.
I cannot imagine the time required to read the 2,100 books on that stick. I am on the other end of the spectrum in that I keep about 50 books on the 500 in use only about 30 MB of storage.
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