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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
ATA-4
UDMA
Ultra-ATA
Ultra DMA
(Or "Ultra DMA", "UDMA", "Ultra-ATA", "Ultra-DMA/33") A
development of the Advanced Technology Attachment specifications
which gives nearly twice the maximum transfer rate of the ATA-3
standard (PIO Mode 4).
ATA-4 Extensions Ultra DMA/33 Synchronous DMA Mode maximum {burst
transfer rates}:
Mode Cycle Time Transfer Rate
ns MB/s
0 235 16
1 160 24
2 120 33
This is achieved by improving timing windows in the protocol
on the ATA interface; reducing propagation delays by
pipelining data transfers and transferring data in
synchronous (strobed) mode.
Developed by Quantum Corporation, ATA-4 has been freely
licensed to manufacturers and is supported by {Intel
Corporation}.
(1998-09-30)