UltraStor 22CA ESDI Controller Needs /Double_Buffer+ Line

 Last reviewed: December 5, 1994
Article ID: Q83702
The information in this article applies to:
  • Microsoft Windows operating system versions 3.1, 3.11

SYMPTOMS

When you use an UltraStor 22CA ESDI hard drive controller with version 1.02 or earlier of the UltraStor Virtual DMA Services (VDS) driver UVDS.SYS, Microsoft Windows version 3.1 may return to the MS-DOS command prompt when you start Windows in 386 enhanced mode.

WORKAROUND

To correct this problem, do the following:

  1. Edit the CONFIG.SYS file with a standard ASCII text editor.

  2. Add the following line: 

          device=c:\windows\smartdrv.exe /double_buffer+

NOTE: You do not need to modify the existing SMARTDRV.EXE entry in the AUTOEXEC.BAT file.

MORE INFORMATION

Some ESDI hard drives require the VIRTUALHDIRQ=OFF line in the [386enh] section of the SYSTEM.INI file. To test if this line is needed in Windows 3.1, start Windows with the following command: 

   win /d:v
If Windows starts successfully, the VIRTUALHDIRQ=OFF line is necessary.

The 22CA ESDI hard drive controller is manufactured by UltraStor, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

KBCategory: kbhw kb3rdparty kbenv
KBSubcategory: win31
Additional reference words: 3.10 "Error Loading GDI.EXE"

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Last reviewed: December 5, 1994
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