3 ms·

Heard of Checksum? https://en.wikipedia.org/wiki/Checksum https://en.wikipedia.org/wiki/Checksum

• SideQuark 4y ago
  Checksums don't provide error correction, nor are they without errors. And they cannot be - it's mathematical fact, hence my post.
  • system2 4y ago
    No, but it shows you if your copy is 100% accurate or not. Which proves that 100% identical copy is possible.
    • SideQuark 4y ago
      No, it most certainly does not. A N bit checksum can at most distinguish 2^n different bitstreams as "100% accurate", and that is assuming there are no transmission errors in transmitting the checksum itself. This is proven trivially by the pigenhole priinciple. And for most media, the checksum is itself transmitted over a noisy channel like the rest of the data. Read your link carefully.