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Ultra DMA
By using Direct Memory Access
(DMA), the processor is not tied up. The
original DMA specification moved data at 16.6 MB per
second. Ultra DMA (the 2 is implied) doubled this
to 33 MB/sec. Mode 3 didn't really live long, however Ultra
DMA 4 or UDMA 4 is frequently called Ultra ATA/66,
named from the transfer rate of 66.7 MB/sec. As of this
writing, Ultra ATA/133 is shipping. The fact that it may or may
not become 'official' with ATA/ATAPI-6 won't matter to most of us.
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CertiGuide to A+ (Core Hardware) (http://www.CertiGuide.com/aplush/) on CertiGuide.com
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