1/1/2024 0 Comments Winrar archiver updateIf X=1 and Y=1 then X ⊕ Y = 0 (it's got to be one or other) If X=0 and Y=1 then X ⊕ Y = 1 (one can be true, but not both) If X=1 and Y=0 then X ⊕ Y = 1 (one can be true, but not both) If X=0 and Y=0 then X ⊕ Y = 0 (two falses make a false) XOR is short for exclusive OR, which denotes “either X is true or Y is true, but not both at the same time”, thus following this truth table, which we construct by assuming that X and Y can only have the values 0 (false) or 1 (true): Parity-based correction relies on the XOR operation, which we’ll denote here with the symbol ⊕ (a plus sign inside a circle). These stored error correction data such that multi-part archives could be recovered automatically and completely even if one entire chunk (or more, depending on how much recovery information was kept) ended up lost or irretrievable.Īpparently, RAR archives up to and including version 4 used so-called parity correction newer versions use a computationally more complex but more powerful error correction system known as Reed-Solomon codes. RAR, or WinRAR in its contemporary Windows form, helped to deal with this problem by offering so-called recovery volumes. If one floppy went missing or wouldn’t read back properly, or if one chunk of a 12-part archive upload got deleted from the server by mistake, you were out of luck. The venerable RAR program, short for Roshal’s Archiver after its original creator, has been popular in file sharing and software distribution circles for decades, not least because of its built-in error recovery and file reconstruction features.Įarly internet users will remember, with little fondness, the days when large file transfers were shipped either as compressed archives split across multiple floppy disks, or uploaded to size-conscious online forums as a series of modestly-sized chunks that were first compressed to save space and then expanded into an ASCII-only text-encoded form.
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