- 1). Click "Start" and click "Run."
- 2). Type "cmd" and press "Enter."
- 3). Type "chkdsk x:" and press "Enter," replacing "x" with the letter of the drive with missing allocation units. This will scan your drive for problems.
- 4). Type in "chkdsk x: /f" and press "Enter" if problems are found during the scan. This will repair your drive.
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