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MS-DOS Compatibility Mode Problems with PCI IDE Controllers (Windows 95/98/Me) Popular

If your computer contains a PCI IDE hard disk controller that employs serialization between the two IDE channels, this tip may help you resolve a MS-DOS compatibility mode problem in Device Manager.

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To cause Windows to attempt to reinitialize the protected-mode IDE driver, remove the 'NoIDE' entry from the registry key below.

After you update the registry, restart Windows. Windows will then attempt to initialize the protected-mode driver for the controller.

Note: If no problems are encountered, the file system and virtual memory will operate in 32-bit mode, and Device Manager will not display an exclamation point in a yellow circle for the IDE channels.

Registry Settings
System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\IOS]
Value Name: NoIDE

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Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.

Last modified: March 30, 2002