Case 1 – The Unplugged Drive
Symptom: User removed a 4TB external drive during a file transfer. Next connection, Windows asked to format.
Fix: Ranchkdsk G: /f /x. CHKDSK repaired orphaned files in 45 minutes. Drive accessible. Lost only the file being transferred.
Case 2 – The Clicking Drive
Symptom: Drive made clicking sounds and froze CHKDSK at 0%.
Fix: Canceled CHKDSK. Used a professional cloning tool (HDDSuperClone). Sent to lab – failed heads. CHKDSK would have destroyed the drive.
Case 3 – The Slow Drive
Symptom: Opening folders took 2 minutes.
Fix:chkdsk D: /r /xfound 144 KB in bad sectors. After repair, speed returned to normal for 3 months. User replaced drive.
External drives often use exFAT for cross-platform compatibility. chkdsk on exFAT is less robust than on NTFS; it cannot recover boot sectors as effectively, leading to false "fix completed" messages while the drive remains RAW.
External drives present a unique corruption vector: USB interface instability and improper disconnection. When a drive shows "The file or directory is corrupted and unreadable" or "RAW" file system, users turn to chkdsk. This paper evaluates whether chkdsk is a universal fix or a situational tool.
Error: “Chkdsk cannot run because the volume is in use by another process.” chkdsk on external drive fix
Solutions:
Schedule at next reboot (for internal drives only):
chkdsk E: /f /r
Then press Y and restart.
Still stuck? Use Safe Mode:
Before running CHKDSK:
If the /f or /x switches don't work and the drive won't dismount:
Run CHKDSK if you experience any of these: