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After I enable the DMA mode for IDE drive via "Device Manager" under Windows 2000, the system reboots and the DMA mode for that drive is disabled automatically. What's going on? There isn't VIA BM Ultra ATA driver installed and the hard drive is connected to IDE channel 1 or 2.

There is a tip helps you to enable DMA mode for IDE drives by changing the setting of "Drive Ultra DMA" from default "Auto" to "Disable" in BIOS. Say, the IDE drive is on IDE-1 master, BIOS setting -> Integrated Peripherals -> Onboard IDE-1 Controller-> Master Drive Ultra DMA -> Disable -> Save & Exit Whenever the above setting done, Windows 2000 will enable DMA mode as your wish.