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Enable UDMA66 Mode on Intel Chipsets (Windows 2000/XP) Popular

If you have a computer with an Intel chipset that supports UDMA66, you will still find that UDMA66 mode is disabled by default on Windows 2000 computers. This tweak allows you to enable or disable it.

This tweak can be easily applied using WinGuides Tweak Manager.
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Open your registry and find the key below.

Create a new DWORD value called "EnableUDMA66" and set it to "1" to enable UDMA66 or "0" to disable it.

Restart Windows for the change to take effect.

Note: Before you enable UDMA66 mode make sure that the device supports UDMA66 mode and use an 80-pin IDE cable with the proper pin cut.

Registry Editor Example
|NameTypeData|
|(Default)REG_SZ(value not set)|
|EnableUDMA66REG_DWORD0x00000001 (1)|
-
|HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Class\{4...|
-
Registry Settings
System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Class\
{4D36E96A-E325-11CE-BFC1-08002BE10318}\0000]
Value Name: EnableUDMA66
Data Type: REG_DWORD (DWORD Value)
Value Data: (0 = disabled, 1 = enabled)

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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: June 27, 2002