How to Fix “Data Error (Cyclic Redundancy Check)” in Windows PC

The “Data error (cyclic redundancy check)” error in Windows 11 indicates that the system cannot verify the integrity of data on a drive, typically due to issues with the storage device (such as a hard drive or external drive) or the file system. You may experience this error when trying to access files, copy data, install software, extract archives, or access an external hard drive, USB drive, SD card, or even your internal disk. Well, corrupted system files, registry corruption, interrupted file transfers, malware infections, or faulty connections are among the common reasons for this. Whatever the cause, here are effective troubleshooting methods to fix the Cyclic Redundancy Check (CRC) error on a Windows PC.

What is a Cyclic Redundancy Check?

A Cyclic Redundancy Check (CRC) is a data verification method or an error-detecting code used by Windows to verify data integrity as it is read from or written to a storage device. Every time you copy, read, or move a file, Windows checks whether the data matches its expected structure.

When a “data error (cyclic redundancy check)” occurs, it means the data has been corrupted, and the system detected an inconsistency between the data and its expected CRC value. This can happen due to physical damage to the drive (like bad sectors), file system corruption, or issues during program installation.

Corrupt Files or Bad Sectors – Damaged files or sectors on a hard drive, external HDD, USB, or SD card.
Hard Drive Issues – A failing or aging hard drive with physical damage can trigger CRC errors.
Interrupted File Transfers – Power failures or abrupt system shutdowns while transferring data.
Corrupt System Files – System file corruption can compromise data integrity.
Malware or Viruses – Harmful programs can corrupt data, causing CRC errors.
Faulty Cables or Connections – A damaged USB cable or a loose SATA connection can cause data transmission issues.

Restart Your PC and Reconnect the Drive

Temporary glitches, communication interruptions, or loose connections can trigger a cyclic redundancy check error. Restarting resets the system, and reconnecting the drive ensures a stable link.

Restart your Windows PC.
Unplug the external device (USB/HDD/SD).
Reconnect it to another USB port.
Try accessing your files again.

Try a Different USB Port or Cable (For External HDD/SSD)

A defective USB cable or weak USB ports can interrupt data transfer and trigger CRC errors.

Use a different USB cable (for external HDD/SSD).
Connect to a USB 3.0/3.1 port directly on the motherboard (rear panel).
Avoid front-panel USB ports or cheap USB hubs.

Check Loose SATA Cable Connections (For Internal HDD/SSD)

Internal HDDs and SSDs connect to the motherboard using SATA data and SATA power cables. If either cable becomes loose, dusty, or partially disconnected, Windows may fail to read data properly.

Shut down your PC completely and unplug the power cable. Open your PC case (desktop only).
Locate your internal HDD/SSD, unplug and replug the SATA and power cable properly. Ensure both ends fit tightly and securely.
If possible, try a different SATA port on the motherboard or a different SATA cable.
Close the case, reconnect the power cable, and turn on your PC.

Run CHKDSK Scan (Fixes Bad Sectors and File System Errors)

CHKDSK (Check Disk) is a built-in Windows utility that scans and repairs disk errors, including bad sectors and corrupted files, the most common cause of CRC issues.

Press Start, type cmd, right-click Command Prompt, and select Run as administrator.
Type command, chkdsk X: /f /r /x and press enter key (Replace “X” with the drive letter of the affected disk.)
The tool will scan and fix disk errors. If prompted, press Y to schedule a scan on restart.
Restart your PC and check if the issue is resolved.

Note: This may take time depending on disk size and damage level.

Run SFC and DISM (Repair Corrupt System Files)

If the Cyclic Redundancy Check error is caused by corrupt system files, running the System File Checker may help.

Again, open the command prompt as administrator,
Run the command sfc /scannow to scan and automatically repair corrupted system files.
In addition, run the Deployment Image Servicing and Management (DISM) restore health command to fix deeper system corruption issues.
On the command prompt window, type DISM /Online /Cleanup-Image /RestoreHealth and press the Enter key.
Wait for the scanning process to complete 100% and restart your computer.
Now try accessing the affected drive or file again.

Scan for Malware and Viruses

Malware can corrupt files and cause Cyclic Redundancy Check error. Performing a full system scan can help identify and remove threats.

Open Windows Security (Win + I > Update & Security > Windows Security).
Click on Virus & threat protection.
Select Full scan and click Scan now.
If malware is detected, follow the prompts to remove it and restart your PC.

Use Diskpart to Clean and Rebuild the Drive

Diskpart allows you to wipe corrupted partitions completely and create a new, clean file system. This is helpful when the partition table or MBR is severely damaged.

Note:

If you are having this Problem on the System Drive (C: Drive), do not apply the steps below. Contact a computer technician or HDD support to resolve the issue.
Diskpart erases everything. Back up important files before performing these steps.

Follow the steps carefully:

Click on the Start menu, search for Diskpart and hit the Enter key.
Then type the list disk command to identify all the available devices.
Then type list volume to list all available Disk drive letters.
Now, Type select Volume D (Note: Replace D with the volume number assigned to the device) to select the problematic drive.
Then type the clean command to clean the drive.

Now, you’re going to create a new partition using the create partition primary command.
Type the command select partition 1 to select the recently added partition.
Then type the command activate to activate the new partition
Format the drive with NTFS using the command format FS=NTFS label=[add the letter your new drive] quick. Type the command without the brackets.
Assign a new drive letter (replace Y with your choice): assign letter=Y
Your drive will now appear as a fresh, clean volume in File Explorer.

Format the Drive (Last Resort Solution)

If the Above All solution didn’t work, and you are Still Getting a Data Error Cyclic Redundancy Check, then try formatting the problematic drive.

Note: Formatting the Drive will erase all Data, but the Data is more important for you, so you can use a professional Data Recovery Tool to recover the data and This Step does not apply to system drives (C: Drive)

To format the Drive, open Command Prompt as administrator, then type format D: /FS:NTFS and press Enter. (Note: Replace D: with the letter of the problematic Drive.)

Note: If the drive is still inaccessible, use data recovery software like Recuva, EaseUS Data Recovery, or MiniTool Power Data Recovery to extract important files.

Data error (cyclic redundancy check) on Outlook

If you are getting cyclic redundancy check error on Outlook. Then, First Check for Drive Errors using the CHKDSK Utility and repair corrupted system files. And repair your Personal Storage Table (PST) file with the Inbox Repair Tool with the help of Microsoft’s support page.

FAQ: Frequently Asked Questions

1. What does “Data error (cyclic redundancy check)” mean?
It means Windows detected corruption while reading or copying data, usually due to bad sectors or damaged files.

2. Can a hard drive with CRC errors be repaired?
Yes, if the issue is logical (corrupted file system). But if the drive has physical damage, it may fail soon.

3. Does formatting fix CRC errors?
Yes—formatting removes corrupted file structures, but it also erases all data.

4. What tool fixes CRC errors?
CHKDSK is the most effective built-in tool to scan and repair disk errors.

5. Should I replace the disk if CRC keeps coming back?
Yes, repeated CRC errors usually mean the drive is failing and should be replaced.

Robeg

I am Robeg founder of this blog. My qualification. completed Bachelor of Arts (BA) and Microsoft Certified Professional (MCP). With a strong background in computer applications love write articles on Microsoft Windows (11, 10, etc.) Cybersecurity, WordPress and more.