HOWTO: Enabling UDMA66 Mode on Intel Chipsets

ID: Q247951

The information in this article applies to:

Microsoft Windows 2000
on the following platforms: x86

IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SUMMARY

The UDMA66 mode is disabled by default on a Windows 2000 computer with a Intel chipset that supports UDMA66. This is by design. The procedure in the "More Information" section explains how to enable it.

MORE INFORMATION

To enable the UDMA66 mode:

Make sure the device supports UDMA66 mode.

Use 80-pin IDE cable with the proper pin cut.

Add the following registry key.

NOTE: For information about the IDE cable contact the hardware manufacturer.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

Start Registry Editor (Regedt32.exe).

Locate the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}\0000

On the Edit menu, click Add Value, and then add the following registry value:


   Value Name: EnableUDMA66
   Data Type:  REG_DWORD
   Value:      1

Quit Registry Editor.

Restart the computer.

Upon restart the UDMA66 will be enabled if supported by the hardware.

Additional query words:

Keywords : kbDDK kbWinOS2000 kbStorageDev kbDSupport kbGrpNTDDK
Version : WINDOWS:
Platform : WINDOWS
Issue type : kbhowto