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The XCRC command uses a CRC (Cyclic Redundancy Check) algorithm to calculate the hash value of the file. This value can be used to verify the integrity of the file transfers. If the CRC value of the local and remote file match, both files are considered equal and therefore the transfer is successful.
If the server supports the XCRC command SmartFTP verifies the transfers. If the XCRC check fails, SmartFTP automatically renames the bad file and restarts the file transfer.