What kind of verification does Hedge use?

Hedge verifies sources and the copy process. Hashes are created when reading from the source disks, and while the copy is being written to the destination. For this, Hedge uses the xxHash64 algorithm. It is a non-cryptographic hash algorithm, and it’s fast. Really fast. Our benchmarks show it is at least 15% faster than MD5. If you have a fast Mac, the speed gain can be a lot bigger. Some of our users have reported a 40% speed increase.

Why can't I choose which algorithm Hedge uses?

Because there's no quality difference between the algorithms commonly used for verification, it's just a matter of speed. That's why Hedge only uses the fastest algorithm available.