Knowledge Base

ScanDisk in Setup Does Not Scan DriveSpace 3 Drive's MDFAT

Article ID: 140012

Article Last Modified on 1/19/2007

Microsoft Windows 95
Microsoft Plus! 95 Standard Edition

This article was previously published under Q140012

SYMPTOMS

When you install Windows 95 over an existing installation of Windows 95 on a hard disk compressed with DriveSpace 3, the version of ScanDisk run by Setup can check only the FAT for potential errors. The version of ScanDisk run by Setup cannot check the MDFAT. If you did not update your Windows 95 Startup Disk with Microsoft Plus!, the same situation occurs with the version of ScanDisk on the Startup Disk.

CAUSE

The version of ScanDisk run by Setup is not designed to work with DriveSpace 3.

RESOLUTION

Before you run Setup again, run ScanDisk with the Thorough option on all drives, including the compressed drive and its host drive. Run ScanDisk from the System Tools menu, or from your Startup Disk (if it was upgraded with Microsoft Plus!).

MORE INFORMATION

The version of ScanDisk run by Setup checks only the cluster-based file allocation table (FAT) on drives compressed with DriveSpace 3. Because DriveSpace 3 uses a Microsoft DoubleSpace FAT (MDFAT) for sector allocation, ScanDisk cannot check portions of the compressed drive for errors.

Note that the version of ScanDisk run by Setup can check drives compressed with DriveSpace and DoubleSpace (but not DriveSpace 3). ScanDisk checks drives compressed with third-party compression (such as SuperStor or Stacker) as normal FAT drives only.

For additional information, please see the following articles in the Microsoft Knowledge Base:

136900 Manually Updating the Startup Disk After Installing MS Plus!

134859 DriveSpace VxD and Real-Mode Driver are Mismatched

Keywords: KB140012