Quick overview:
Since the birth of Windows 2000, it has been accompanied by a very special teething problem: It does not support hard disks operating in UltraDMA/66 mode (or higher) and assigns them the much slower UltraDMA/33 mode.
With DMA/66, a hard disk can theoretically push up to 66 megabytes per second through the lines. There are now devices with up to 133 MB, which promises maximum performance. If you still have Windows 2000 without Service Pack 1 (i.e. a purchased version without updates), you are also affected by this error and can work around it as follows:
1. Click on Start/Run and enter regedit in the command line.
2. Navigate through the keys HKEY_LOCAL_MACHINE\SYSTEM\C urrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}\0000 and right-click in the right pane.
3. Select New/DWORD value from the context menu that appears. Give this self-created value the name EnableUDMA66.
After a restart, the hard disk will run much faster, accesses will be shorter and general performance will increase.
NOTE FOR NEW PUBLICATION: This article was produced by Sandro Villinger and comes from the Windows Tweaks archive, which has been built up since the late 1990s.
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