FTP Software – Using XCRC to Verify Data Integrity

So FTP software support XCRC error checking, a feature that has been added to many FTP Servers, such as Serv-U. The XCRC command uses a CRC (cyclic redundancy check) to verify the data was transferred correctly. The algorithm used is CRC-32, a very well known standard algorithm that ensures the data sent is the same as the data received.When FTP softwware is connected to a server that supports XCRC, it automatically checks the XCRC value with the server to ensure the content of the data is correct. If the XCRC check fails, FTP  automatically retries the file transfer.

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