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Thread: cyclic redundancy check

  1. #1
    Junior Member
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    Default cyclic redundancy check

    can anyone help mw with a fix for a error code cyclic redundancy> i use dvdshrink 3.2 and keep getting this message on some disk but not all of them

  2. #2
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    rcubed's Avatar
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    Default CRC (cyclic redundancy check) Errors

    Hi jbkb987,
    CRC errors are an indication that the data on the CD or DVD has errors than can not be corrected. Errors occur all the time when reading CDs or DVDs, but there are facilities built into the CD/DVD structure that allow the player to reconstruct data that is in error. A CRC error indicates the damage was sufficient to not allow the data to be recovered (corrected). In a lot of cases this can be caused by dirt, fingerprint, or other contaminates on the surface of the disk, or in severe cases scratches.

    You didn't indicate if these were commercial (pressed disks) or recordable disks (-R, +R, or RW etc). If they were recordable disks the problem may be in the quality of blanks that were written or the burner used for burning or both. Although surface contamination/scratches can also affect the readability of those disks. Depending on your DVD drive there are programs such as Nero Disk Speed or Opti Drive Control which will attempt to read the disk and identify the errors these will not fix the data, but will give you some idea about how bad the situation is. Some DVD drives do not support the operations needed by these programs. Look under tools (on VideoHelp.com) for such programs or do a Google Search. IsoBuster is a program that will attempt to recover as much data as it can (sometimes this in not 100% effective and can take a long time). Bad data can cause skips and hangs when the disk is copied with errors and then burned to a new disk.

    Do a search on how to clean and or repair disks. If it is just dirt or finger prints washing the disk under warm tap water using a mild detergent that won't leave a residue on the disk and then drying the disk with a clean lint free cloth (microfiber is best). Blotting at 1st is best then wipe the remainder from the disk. Be sure to wipe the disk from the center out to the edge, not in a circular pattern along the surface (tracks in) of the disk. If your tap water is pure enough you could just allow the disk to air dry. The water in our area will leave deposits if allowed to air dry.

    Let us know how you make out.

    rcubed
    Last edited by rcubed; 5 Aug 2010 at 01:40 PM

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