Just to clarify how ioZS checks the SFV:
CRC value is passed from ioFTPD to ioZS, ioZS compares the CRC from io to the CRC in the SFV (if present, otherwise it just stores it until the SFV is upped). If the CRC passed from io does not match the CRC from the SFV, then it reads the file and calculates the CRC itself and compares again with the SFV, if they still don't match, then the file is marked as bad. So in a sense, the file is checked twice before marking it bad.
hmm, bizniz makes a good point, what is the CRC value of the bad files?
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