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

 Last reviewed: November 22, 1995
Article ID: Q140012
The information in this article applies to:
  • Microsoft Windows 95
  • Microsoft Plus! for Windows 95

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: 

   ARTICLE-ID: Q136900
   TITLE     : Manually Updating the Startup Disk After Installing MS
               Plus!

   ARTICLE-ID: Q134859
   TITLE     : DriveSpace VxD and Real-Mode Driver are Mismatched

KBCategory: kbsetup kbtool
KBSubcategory: win95 drvspace
Additional reference words: 95

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Last reviewed: November 22, 1995
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