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IDE Bus Master Support

Common Options : Enabled, Disabled

Quick Review

This BIOS feature is a misnomer since it doesn't actually control the bus mastering ability of the onboard IDE controller. It is actually a toggle for the built-in driver that allows the onboard IDE controller to perform DMA (Direct Memory Access) transfers.

When this BIOS feature is enabled, the BIOS loads up the 16-bit busmastering driver for the onboard IDE controller. This allows the IDE controller to transfer data via DMA, resulting in greatly improved transfer rates and lower CPU utilization in real mode DOS and during the loading of other operating systems.

When this BIOS feature is disabled, the BIOS will not load up the 16-bit busmastering driver for the onboard IDE controller. The IDE controller will then transfer data via PIO.

Therefore, it is recommended that you enable IDE Bus Master Support. This greatly improves the IDE transfer rate and reduces the CPU utilization during the booting process or when you are using real mode DOS. Users of DOS-based disk utilities like Norton Ghost can expect to benefit a lot from this feature.

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