[WIP] Speedup sync#12

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elbandi wants to merge 5 commits intoc4milo:masterfrom

Commits on May 22, 2018

Allow change block size
elbandi
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Commits on May 26, 2018

Commits on May 28, 2018

Calculate the readed data hash
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Commits on May 17, 2020

Calculate written data hash
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