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The Ultra DMA (Ultra Direct Memory Access, UDMA) interface was the fastest method used to transfer data between the computer (through the ATA controller) and an ATA device until Serial ATA. UDMA took over from Single/Multiword DMA as the choice of interface between ATA devices and the computer. There are 8 different UDMA modes, ranging from 0 to 6 for ATA, 0 to 7 (for CompactFlash), each with its own timing.
|Mode||Number||Also called||Maximum transfer
|7||Ultra ATA/167||167||CompactFlash 6.0|
- PIO—The first interface type used between devices (mainly hard disks) and the computer.
- Parallel ATA
- Serial ATA