Ultra ATA - technical definition

An enhanced version of the IDE interface that transfers data at 33, 66 or 100 Mbytes/sec. These enhancements are also called "Ultra DMA," "UDMA," "ATA-33," "ATA-66," "ATA-100," "DMA-33," "DMA-66" and "DMA-100." See IDE for all the ATA types and speeds.