Are you sure that the "F" drive on the PC refers to the main BeBook memory and not the SD slot ?
Have you tried checking on the BeBook that your display refers to the Internal Storage rather than the SD Card ? (Menu, then does item 5 show "Built-in Storage" or "SD Card" ?
Have you tried putting a SD card in the BeBook slot and sticking some books on it (say in a folder called "Books") You could put the books on the card directly with your PC before inserting the card.
Once you have a SD card mounted your PC should show another drive that refers to the card.
To me it sounds like the internal user storage memory has become corrupted. This memory is exposed to USB via a bit of Linux software called "Mass Storage Gadget". Installing fresh firmware should sort this out unless the actual memory chip is damaged.
Another thought - have you set the time/date on the BeBook ? I don't think it should matter but always worth a check.
BobC
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