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Sandisk released a whitepaper on their SD wear leveling in 2003, not sure if it's changed significantly since then or not: https://web.archive.org/web/20150326122100/http://ugweb.cs.u...

With modern TLC flash any card without wear leveling would fail pretty quickly.

Wear leveling is actually a major problem for applications where power might be suddenly cut, because if it happens while the wear leveling is running then the block allocation table can be corrupted which leaves the whole card unreadable. It's a pretty common complaint among i.e. raspberry pi users who tend to unplug them without shutting down.



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