If your data is irreplaceable, consider using a tool like TestDisk (free) or Recuva to image the drive before running CHKDSK. CHKDSK alters the file system, which may overwrite deleted files you hoped to recover.
Error: “Chkdsk cannot run because the volume is in use by another process.”
Solutions:
Schedule at next reboot (for internal drives only): chkdsk on external drive fix
chkdsk E: /f /r
Then press Y and restart.
Still stuck? Use Safe Mode:
When an external drive reports corruption, Windows marks the volume dirty. chkdsk performs a three-stage process: If your data is irreplaceable, consider using a
The "Fix" Mechanism:
Use this for simple issues or when you prefer a GUI; for stronger repairs use Command Prompt.
Once the scan finishes, you will see a summary. Schedule at next reboot (for internal drives only):
If your external hard drive is acting up—showing errors, becoming inaccessible, or prompting you to format it—Windows has a built-in tool that can often resolve the issue without data loss. That tool is chkdsk (Check Disk).
This guide covers two methods to run this repair: using the Windows File Explorer (the easy way) and using the Command Prompt (the powerful way).
Open File Explorer → This PC → Note the drive letter of your external drive (e.g., E:, F:, G:). Mistyping this can result in CHKDSK scanning your internal system drive.
External hard drives (HDDs/SSDs) are prone to file system corruption due to unsafe ejection, logical bad sectors, and sudden power loss. The Windows utility chkdsk is commonly prescribed as a first-line fix. This paper examines the command's operational mechanics (/f, /r), its success rate in restoring drive accessibility, and the critical risk of data loss when used on failing physical media. Results indicate that while chkdsk effectively resolves logical corruption (e.g., orphaned files, incorrect bitmaps), it is contraindicated for drives with mechanical failure.