Floppy Disk Drive Lights Flash Under MS-DOS 6.2 (105257)
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 Q105257
This information applies to both Microsoft DoubleSpace and Microsoft
DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands
When you start some software packages under MS-DOS 6.2, the floppy
disk drive lights may flash.
This situation occurs when a software program (for example, Microsoft
Anti-Virus, GEO Works Ensemble (GEOS), or a terminate-and-stay-
resident (TSR) program loaded in memory calls the Int 21h Function 44h
Get Device Parameter IOCTL. This IOCTL causes the DoubleSpace
Automount code to check the floppy disk drives for possible
DoubleSpace-compressed floppy disks.
The following list includes some of the applications that make this
call that otherwise would not access the floppy disk drives:
Norton Desktop for Windows
Central Point PCTools Data Monitor (DATAMON.EXE)
This situation does not occur with earlier versions of MS-DOS, nor
does it occur if the DoubleSpace Automount switch is disabled.
You can either ignore the floppy drive light indicators when you start
applications or you can disable the DoubleSpace Automount switch.
To disable the DoubleSpace Automount switch, type dblspace
/automount=0 at the MS-DOS command
prompt, press ENTER, and then press CTRL+ALT+DEL to reboot your
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