Run chkdsk C: /f /r in an admin Command Prompt to fix file system errors and clear the dirty bit, scheduling it on reboot if the drive is in use. 2. Optionally, run sfc /scannow and Disk Cleanup to repair system files and remove temporary data. 3. Check disk health using CrystalDiskInfo or wmic diskdrive get status to rule out hardware failure if the issue recurs. 4. Prevent future occurrences by ensuring proper shutdowns, avoiding forced reboots, using a UPS, and performing regular maintenance. Running chkdsk is the primary solution, and the dirty bit is cleared once the system verifies the drive's integrity, with persistent issues likely indicating underlying hardware problems.
If you're seeing a "dirty disk bit" error—especially on a Windows system—it usually means the file system wasn't properly unmounted the last time the drive was used. This can happen after an improper shutdown, forced restart, or sudden power loss. The OS sets a "dirty bit" as a flag to indicate the volume may need checking for errors.

Here’s how to fix it:
1. Run CHKDSK (Check Disk)
This is the most common and effective way to clear the dirty bit and fix potential file system issues.

Steps:
- Press
Windows X
and select Command Prompt (Admin) or Windows Terminal (Admin). - Type the following command (replace
C:
with your drive letter if needed):
chkdsk C: /f /r
/f
= fixes errors on the disk/r
= locates bad sectors and recovers readable information
? You might see: "Chkdsk cannot run because the volume is in use..."
In that case, press Y to schedule the check on the next reboot, then restart your PC.
After reboot, the scan will run before Windows loads—this can take time depending on drive size and errors found.
2. Use Disk Cleanup and SFC (Optional but helpful)
Sometimes file corruption contributes to the issue.
- Open Command Prompt as admin again and run:
sfc /scannow
This scans and repairs system file integrity.
Also, run Disk Cleanup to remove temporary files that might interfere.
3. Check Disk Health (Especially for Recurring Issues)
If the dirty bit keeps returning, your drive might be failing.
Use tools like:
- CrystalDiskInfo (free) – shows SMART status
- Windows built-in tool: In Command Prompt:
wmic diskdrive get status
If it says "OK", hardware is likely fine. If not, consider backing up and replacing the drive.
4. Prevent Future Dirty Bits
- Always shut down properly.
- Avoid forced reboots.
- Use a UPS during power fluctuations.
- Keep your drives healthy with regular maintenance.
Basically, running
chkdsk /f /r
is the go-to fix. The dirty bit is just a flag—it gets cleared once the system confirms the drive is clean. If problems persist, suspect underlying hardware issues.The above is the detailed content of How to fix a dirty disk bit. For more information, please follow other related articles on the PHP Chinese website!

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