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  1. #1
    Member MatrixmaN's Avatar
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    What does the "CRC Failed" error mean?

    Do ya know?

    Sometimes my zips get that.

  2. #2
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    It means that the cyclic redundancy check of the file has failed. Meaning, the file is not an exact copy of the original, meaning a tcp packet has been corrupted during the transfer, meaning entire file/some files inside are unusable.
    -M

  3. #3
    Member MatrixmaN's Avatar
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    And there's no way to fix that?

    The files ran fine awhile ago, now they have that Cylic Thingy and I can't access some backed up stuff.

    No Scandisk for files I assume?

  4. #4
    1010011010 jmichna's Avatar
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    Originally posted by MatrixmaN
    And there's no way to fix that?....
    Usually you see CRC errors in modem downloads/uploads... a good error-correcting modem is supposed to detect CRC errors and re-send the data.

    Try re-downloading the file.

    If this is occuring when you are zipping files, then something else must be going on... maybe a mildly corrupted zip program file is causing errors?
    "The trouble with our liberal friends is not that they're ignorant; It's just that they know so much that isn't so." -- Ronald Reagan

  5. #5
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    Local files might get corrupted because you move them around alot on a bad fs (eg. fat32), or you've overclocked your processor and the ide channel can't handle it anymore.
    -M

  6. #6
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    Wink CRC's recoverable? Answer is complicated...

    Matrixman asked if files are recoverable after his computer detected a CRC error...

    There are many ways a CRC error can happen and not just to files so if wanting to know if its recoverable isn't really straightforward. Reason being is CRC checking is very pervasive in all facets of transporting from one to another in a computer or between computers. It can literally happen at every data interface inside your PC that incorporates CRC in hardware. A bad motherboard design where the interfaces weren't designed properly or were damaged can cause them. A failing or marginal microchip that receives or transmits data and instructions can cause CRC errors. So if you're having a hardware problem your system usually gets increasingly unstable and you'll start having more and more problems as the marginal component degrades. This might be the case since you stated its getting worse with time.

    If not, it still could be a software problem since you said 'zip file'. Specifically in the case of software (like Winzip/RAR) contributing to CRC errors its usually limited only to 'compressed' data file types (like a ZIP, MP3, AVI, MP4, etc.) In which case the CRC is used to validate the integrity of the compressed data against a short hexadecimal code that is like a unique fingerprint of the original uncompressed data. A 'checksum' is generated in software at the same time the file is compressed and is then merged with the compressed file data to become one file. When the file is uncompressed the decompression software compares the checksum against the freshly uncompressed data. If there is even a single bit different the checksum won't match and an error reported.

    Bottom line: take the easiest route to solve followed by increasingly harder routes. Redownloading is easy. If it doesn't work, take the file to a different computer not on your network (in case a virus is intentionally corrupting your zip files... yes it happens and if a virus, then moving the file to another PC risks infection). Reinstall your compression software. If the problem starts getting worse, you can't tell if hardware or software and you own a windows based PC, then go buy a Mac. They're well designed in both hardware and software and darn near bullet proof.

  7. #7
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    CRC means (Cyclic Redundancy Check). It is an error detection mechanism used to indicate the file's integrity. CRC failure means that the file is corrupted (this is the only purpose of CRC, file error checking).

    You can try this:Select several files and generate a RAR file (file compression). Now, UnRAR the same file (file extraction). See if you get CRC Failed.

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