DMA, Ultra

Ultra DMA is a technology used by PATA units and provides the best transfer rates available for PATA units today. For compatibility reasons SATA units report UDMA support; however in reality they use a different transfer method. UDMA modes up to mode 2 can be reached over 'standard' PATA 40 wire cables; higher modes require a 80 wire cable.

Mode:Maximum speed
0 16.7 MB/s
1 25.0 MB/s
2 33.3 MB/s
3 44.4 MB/s
4 66.7 MB/s
5 100.0 MB/s
6 133.0 MB/s

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