Tixy (12022-12-26): > He didn't mention filesystems. > > The controller in the card would surely know what flash blocks contain > data, so writing the whole card first would reserve those blocks as > 'in-use' leaving just a relatively small amount of spare blocks which > would be available for erasure and reuse the that repeated write.
Unless the card is brand new, “what flash blocks contain data” is “all of them”. The information whether a block is used or not used resides in the filesystem data structures. -- Nicolas George
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