Applies To:
  • CitectSCADA 1.00, 1.01, 1.10, 1.11, 1.20, 2.00, 2.01
Summary:
If you are using MS-DOS 6.0 and Smartdrv with write caching enabled, data corruption may occur on your hard disk. This can result in many strange errors. This is particularly bad when using MS-DOS 6.0 and Double Space Disk Compression because when the data corruption gets to a certain level, the Double Space Drive will become unreadable and all data will be lost.

To check for this happening, shutdown Windows and return to the DOS prompt.

Run SMARTDRV /S. This will give you the status of Smartdrv. If the Status table reports Write Caching Enabled then you should turn this off. 

Solution:
Edit your AUTOEXEC.BAT file in your C:\ directory. There will be a line similar to:

C:\DOS\SMARTDRV.EXE

Change this to:

C:\DOS\SMARTDRV.EXE C for MS-DOS 6.0 or
C:\DOS\SMARTDRV.EXE /X for MS-DOS 6.2

You should also run CHKDSK /f to check the current state of your Hard Disk and to fix any current errors. You must run CHKDSK outside of Windows as you cannot use the /f option in a DOS box.

See Also Q1171 
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