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Q107711: ScanDisk Reports Compressed Floppy Too Full for Undo

Article: Q107711
Product(s): Microsoft Disk Operating System
Version(s): MS-DOS:6.2
Operating System(s): 
Keyword(s): 
Last Modified: 25-NOV-1999

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The information in this article applies to:

- Microsoft MS-DOS operating system version 6.2 
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SYMPTOMS
========

When ScanDisk finds errors, it prompts you to create an Undo disk before
correcting the errors. (You also have the option to skip the Undo disk step.) If
you choose to create an Undo disk, you must save the information to a floppy
disk. If you insert a disk that has been compressed by DoubleSpace, the
following message may appear

  The disk in drive <x> is too full to be used as an Undo disk. To ensure
  that there is enough room for all the Undo information, make sure the floppy
  disk has at least 300,000 bytes of free space.

where drive <x> is the DoubleSpace-compressed floppy disk.

CAUSE
=====

ScanDisk cannot mount a compressed disk for use as the Undo disk, even if
Automount is enabled in DoubleSpace Manager.

RESOLUTION
==========

Before you run ScanDisk, be sure the potential Undo disk is mounted. The
compressed floppy disk must be inserted in the disk drive prior to starting
ScanDisk. Any action (such as DIR or CHKDSK) you run on that floppy disk drive
causes the system to mount the disk. ScanDisk then recognizes the compressed
free space on that disk.

STATUS
======

This situation does not occur in MS-DOS version 6.22. DriveSpace functionality
was enhanced to correctly deal with ScanDisk Undo disk.


Additional query words: dblspace 6.20 insufficient disk enough

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Keywords          :  
Technology        : kbMSDOSSearch kbMSDOS620
Version           : MS-DOS:6.2

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