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ATA/ATAPI using DMA: Difference between revisions
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It is very important to understand that there are several different types of DMA on a machine. The DMA that is used for ATA drives is called PCI Busmastering DMA. It is very fast. It is completely different from ISA DMA, which is limited to 4MB per second. Anything you may have read about 8bit or 16bit DMA channels 0 through 7, <b>does not apply to disk DMA at all.</b>
ATA singleword DMA, ATA multiword DMA, UDMA, and [[ADMA]] are all PCI Busmastering DMA types.
==UDMA==
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