Not commenting on whether the 16MB information is correct or not, but grandparent's point is not that only 16MB gets write-leveled; it's that for the purpose of write-leveling, the drive is treated as a series of 16MB blocks, each of them are write-leveling within themselves. (The write-leveling circuitry would then be much simpler -- imagine a parallel series of, say, 8-bit adders, compared to a 64-bit adders made up of 8-bit adders)
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