Article ID: 139987 - View products that this article applies to.
This article was previously published under Q139987
After you upgrade an Acer computer from an earlier version of Windows to Windows 95, the following problems may occur:
These problems can occur if the CD-ROM drive is connected to a CMD CSA- 6400E PCI IDE controller. The Cmd640x.sys real-mode driver on Acer computers is designed to work in Windows 3.1 and does not work in Windows 95.
If you use the CMD 6400 PCI controller protected-mode driver CMD CSA- 6400E, 32-bit disk and file access is functional but the CD-ROM drive is not detected.
If you use the CMD 6400 PCI controller real-mode driver Cmd640x.sys, the CD-ROM drive is detected, but 32-bit disk and file access is not available.
All Acer computer systems with a part number starting with 91.AA043 or 91.AA260 using the CMD CSA-6400E PCI IDE controller and a Maxtor 7546AT hard disk running Windows 95 exhibit this behavior.
To correct this problem, load the Windows 95 version of the CMD CSA- 6400E PCI IDE driver. Download the self-extracting file Cmdwin95.exe from Acer's FTP server (ftp.acer.com), or from Acer's World Wide Web site (www.acer.com/aac/win95/upgrades/ftp.htm). For additional information, please contact Acer Technical Support.
You may be able to resolve this issue using the following steps:
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