BIOS setting has no influence on what Windows is using. Windows controls the
hardware directly, not through the BIOS. There are some exceptions, but for
standard IDE this is always the case. The BIOS settings just change how the
system accesses the drives during BOOT. Setting to "Auto" is usually the
In BIOS, my CD burners are set to PIO mode 4 and DMA mode 2. DMA mode 4 is
also available. Is there any advantage to switching to DMA 4 in BIOS? The
IDE controller, both channels, are set to UDMA in Windows 2000.