Optimiser la vitesse du DD si tu a un chipset intel 
HOWTO: Enable UDMA66 Mode on Intel Chipsets
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The information in this article applies to:
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
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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 computer with a Intel chipset that supports UDMA66. This is by design. The procedure in the "More Information" section explains how to enable it.
NOTE: Windows XP supports UDMA 100. Presently, two promise controllers for UDMA 100 are logged.
MORE INFORMATION
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 or Windows 2000, you should also update your Emergency Repair Disk (ERD).
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:
Start Registry Editor (Regedt32.exe).
Locate the following key in the registry:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Con
trol\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.
NOTE: For information about the IDE cable, contact the hardware manufacturer.
When you restart your computer, the UDMA66 will be enabled if it is supported by the hardware.
Additional query words: udma ata66
Keywords : kbDDK kbOSWin2000 kbStorageDev kbDSupport kbGrpDSNTDDK
Issue type : kbhowto
Technology : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWinAdvServSearch kbWinXPProSearch kbWinXPHomeSearch kbWinXPSearch
Last Reviewed: October 21, 2001
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