Setup Reports Less Free Space than MS-DOS (DoubleSpace Drive) (103527)
The information in this article applies to:
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.22
This article was previously published under Q103527
This information applies to both Microsoft DoubleSpace and Microsoft
DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands
You are running Microsoft MS-DOS 6.2 DoubleSpace, drive C is
compressed, and you receive the following message when attempting to
install MS-DOS 6.2 Upgrade or Step-Up:
MS-DOS 6.2 Setup may display this error message if the DoubleSpace
compressed volume file (CVF) does not contain a minimum of 4,200,000
bytes of free contiguous hard disk space (even though sufficient hard
disk space is reported by CHKDSK or DIR).
To work around this problem, defragment the DoubleSpace-compressed
drive using the DoubleSpace Defrag utility. For example, type
dblspace /defrag at the MS-DOS command
prompt and then press ENTER.
DoubleSpace Defrag optimizes the DoubleSpace CVF and creates a
contiguous block of free space in the CVF. You should then be able to
successfully run the MS-DOS 6.2 Setup program.
If Setup still reports there is insufficient space, free some space by
moving or deleting files from the drive.
IMPORTANT: If you are installing MS-DOS 6.2 Step-Up, do
not delete MS-DOS files from your hard disk to free space.
Step-Up requires these files to update your system.
MS-DOS 6.2 Setup uses a new DoubleSpace application program interface
(API) function when you install over MS-DOS 6.2. The new API call
provides Setup with the amount of contiguous free space in the
compressed volume file's "sector heap" (data area).
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