Checksums and CRC can be very quick, but have significant drawbacks. SHA-256 hashes are best, although there are also error-correcting codes used in optical disks.
CRC32
What are checksums, CRCs and hashes? What is required for a hash to be cryptographic, and how any of these affect your Mac? Some answers and explanations.
Businesses are often built on trust, and one of the most fundamental elements of trust must be in the accuracy of the data on your Mac. How should you ensure that your files remain true and correct?
The Eclectic Light Company 