Comment from http://electronics.stackexchange.com/questions/356185/nand-flash-retention-using-usb-charger/356190?noredirect=1#comment855287_356190 claims that reading from flash storage is no lossless operation, so they get refreshed by the flash controller on spare time.
These filesystems do not use journaling, so ejecting the card or
losing power during a write can corrupt it. Even with journaling,
power loss during writes on flash is a touchy issue… you might lose
more than the data that is being written, and it can spread to
adjacent blocks too. A simple write may cause the controller to decide
to move data around, etc…
https://cseweb.ucsd.edu/~swanson/papers/DAC2011PowerCut.pdfhttps://www.embeddedarm.com/about/resource/preventing-filesystem-corruption-in-embedded-linux
Doesn't repeated refreshing wear out these floating-gate transistors?
Best Answer
No, reading does not wear out flash memory. Look at any flash memory datasheet. It is erasing and writing that damage the oxide insulation between the gates and the FET bodies. Reading does not.