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Abbreviation for Ultra Direct Memory Access. UDMA is a protocol developed as an improvement to recent ATA devices that effectively doubles the available transfer rate by allowing the device direct access to the computer memory, bypassing the CPU. This also takes a lot of load off of the CPU. UDMA standards are generally UDMA/33 or UDMA/66, which provides for the current 66MB/s data transfer rate available in modern ATA devices. (See also DMA)

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