As per the help command

--test-drop-download : For net tests: in download, discard ALL blocks instead checking/saving them (very fast)

--fast-block-sync arg (=1) : Sync up most of the way by using embedded, known block hashes.

What is the difference between these two modes of syncing?


The help strings pretty much describe the differences.

The --test-drop-download version wont save the blocks, it's used for testing downloading of blocks.

The --fast-block-sync is a mode for normal operation (not testing) which will still save the downloaded blocks.

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