How to correct a cyclic redundancy error

How to correct a cyclic redundancy error
How to correct a cyclic redundancy error

Cyclic redundancy is a verification method that your computer uses to verify data on disks (such as the hard drive or disks like CDs or DVDs). A cyclic redundancy error can be caused by various problems: registry corruption, an overfilled hard drive, installing a program that did not work, or incorrectly configured files. Whatever the specific cause, the cyclic redundancy error is a serious error and you need to take care of it to avoid data loss or even a complete system crash. Fortunately, there are some easy ways to deal with this problem with free utilities.


Method 1 of 2: Launch the CHKDSK utility

Fix a Cyclic Redundancy Check Error Step 1

Step 1. Find the CHKDSK utility

The CHKDSK (or "check disk") is a native Windows utility that allows you to scan and repair drive errors. It can find and repair a number of errors or corrupted files which could cause cyclic redundancy error. Right click on the drive you want to check and click Properties> Tools. In the section Error checks, click on Check now.

  • If a CD or DVD drive is showing you this error, the disc may have some dust or scratches on it. Try to clean it with a soft cloth before doing anything else.
  • Optical disc errors usually cannot be repaired.
  • If you get this error on a Mac (but it's less common), try the built-in Disk Utility first and repair the disk.
Fix a Cyclic Redundancy Check Error Step 2

Step 2. Decide whether you want to perform Basic or Advanced scan

Check the boxes that indicate if you want to quickly check and repair the drive or if you want to do a more thorough scan. The default option is quick scan.

The quick scan should take 15-20 minutes, while the deeper scan can take hours. Make sure you have enough time and do not interrupt the computer after the scan is started

Fix a Cyclic Redundancy Check Error Step 3

Step 3. Restart the computer to begin the scan

If you scan the primary hard drive (the one you started the computer on), the CHKDSK utility will not be able to scan right away and will schedule it the next time you boot the device.

  • From then on, you can continue to use your computer as usual, restart it when you are sure you have enough time to scan.
  • If you think your hard drive is nearing the end of its life, back up your data to another hard drive before performing the scan. Even if you can't access some data already, back up everything you can just in case.
Fix a Cyclic Redundancy Check Error Step 4

Step 4. Use a different path to the CHKDSK utility

Sometimes it is not possible to start the scan from right click and repair the disk. If the first scan failed to fix the problem, try the other method to launch the CHKDSK utility.

Fix a Cyclic Redundancy Check Error Step 5

Step 5. Open the command prompt

You will find the command prompt in the accessories menu.

Note that you must be logged in as an administrator to launch the CHKDSK and have the necessary privileges to perform the scan

Fix a Cyclic Redundancy Check Error Step 6

Step 6. Type chkdsk / f x: at the command prompt

The letter "x" should be replaced with the letter of the drive you want to scan. Then press Enter.

The previous command is the command to perform the basic scan. For advanced scan, type chkdsk / r x: instead and replace the letter "x" with the drive letter

Fix a Cyclic Redundancy Check Error Step 7

Step 7. Wait for the scan to finish

Once you are done, the CHKDSK will provide you with a report and restart your computer. If the CHKDSK was able to fix the problem, you have nothing more to do.

  • If the scan seems to hang and never finish (even if you leave it running overnight), it is probably because you have too many damaged files and the CHKDSK cannot fix all of them. If so, try the next method.
  • Over time, small corruption and other small errors could appear on your disk for a number of reasons. CHKDSK can only fix small errors, not big problems.

Method 2 of 2: Use a third-party disk repair utility

Fix a Cyclic Redundancy Check Error Step 8

Step 1. Install a disk repair utility

If the CHKDSK could not find a problem with your hard drive, a third-party repair utility may be able to help. Popular options include HDDScan and SeaTools which replace the CHKDSK and may be able to resolve the problem that the CHKDSK did not find.

  • Many utilities come in different versions suitable for different operating systems (eg Mac or Windows).
  • Watch out for system cleaning programs that come from questionable sources. Instead, look for well-known brands of disk utilities.
Fix a Cyclic Redundancy Check Error Step 9

Step 2. Open the utility and run the scan

Follow the instructions to start the scan on the disk you want to check. The program should then compile a list of all errors encountered in a short report.

Fix a Cyclic Redundancy Check Error Step 10

Step 3. Repair all problems

You can let this process go on without being present, for example overnight. It is important to let the repair complete and depending on the condition of your drive it could take up to 2 hours.

If the repair is not yet complete and the scan has been running for more than four hours, your drive is not working properly. Cancel the scan and save as much data as possible

Fix a Cyclic Redundancy Check Error Step 11

Step 4. Rescan your computer

It should only take a few minutes and you will be sure that you have no more errors.

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