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# Running SCANDISK /ALL While a Virtual Drive Exists

Article ID: 108496

Article Last Modified on 11/25/1999

APPLIES TO

- Microsoft MS-DOS 6.2 Standard Edition
- Microsoft MS-DOS 6.21 Standard Edition
- Microsoft MS-DOS 6.22 Standard Edition

This article was previously published under Q108496

## SYMPTOMS

Running SCANDISK /ALL incorrectly scans virtual drives created using the SUBST command.

## STATUS

Microsoft has confirmed this to be a problem in the ScanDisk program included with MS-DOS versions 6.2, 6.21, and 6.22. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

## MORE INFORMATION

If you use drive A as a virtual drive (for example, by using the command SUBST A: C:\DOS), running SCANDISK A: results in the following error message
Drive A was created by using the SUBST or ASSIGN command and cannot be checked. To check drive A, run ScanDisk on drive C instead.
The error message recommends running ScanDisk on drive C because the physical directory actually resides on C. This is normal.
If you run SCANDISK /ALL, ScanDisk actually diagnoses the virtual drive. While this should not cause errors, Microsoft recommends that you not run SCANDISK /ALL while a virtual drive exists.

Additional query words: 6.20 SCANDISK ALL SUBST

Keywords: KB108496