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by londons_explore 980 days ago
I think some devices built the block storage on top of the key-value store. Ie. when you write "hello..." (4k bytes) to address 123, it actually saves key: 123, value "hello...".

If so, that is probably the reason for a 16 byte key - there is just no way anybody needs a key bigger than 16 bytes for an address anytime soon.