CRC

CRC, checksum file utilities. Calculate the CRC checksum of multiple files.

CrcCheckCopy - verify large data copies by the CRC of each file

Verify by CRC that your file/folder copies are identical.

CrcCheckCopy is a command line utility for Windows and MacOS that compares files by checksum in local or remote folders/disks/DVDs. The utility records the CRC checksum of each file in an external file. It does not need concurrent access to the two folders.