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Ultra DMA
Last modified: Monday, September 20, 2004 

A protocol developed by Quantum Corporation and Intel that supports burst mode data transfer rates of 33.3 MBps. This is twice as fast as the previous disk drive standard for PCs, and is necessary to take advantage of new, faster Ultra ATA disk drives.

The official name for the protocol is Ultra DMA/33. It's also called UDMA, UDMA/33 and DMA mode 33.

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