ASUS P4S533-E motherboard user guide
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Onboard PCI IDE Enable [Both]
This field enables either the primary IDE channel or secondary IDE
channel, or both. You can also set both channels to [Disabled].
Configuration options: [Both] [Primary] [Secondary] [Disabled].
IDE Bus Master Support [Enable]
This field enables or disables the IDE Bus Master Capability under the
DOS environment. Configuration options: [Enabled] [Disabled]