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CHKDSK isn't just a scanner; it’s a repairman. It examines the drive's file system integrity and fixes logical errors. When run with specific "switches," it can also locate —physical spots on the disk that no longer hold data—and instruct the system to ignore them, preventing further corruption. The Step-by-Step Fix
If you get an "Access Denied" error:
If your external hard drive (USB, SSD, or HDD) is acting up—showing corruption errors, refusing to open, or running painfully slow— is your first line of defense. This built-in Windows tool scans for file system errors and bad sectors, then fixes them. chkdsk on external drive fix