Quote:
Originally Posted by j.p.s
Most SD cards use wear leveling to remap sections of updated files to other locations without any visibility to the filesystem level.
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Wear leveling requires a rather complicated logic, SSDs do that with their built in controller chips, but SD cards don't have such a thing - SD cards are just cheap and dumb storage devices really.
Even so fragmentation is unlikely to be an issue.
Very few people have thousands of ebooks. Most ereaders are not optimized to handle huge libraries gracefully. Personally I only put the books I actually read on the device, so while the entire Gutenberg / public domain collection is nice to have, it'd probably just get in the way on the reader...