<storage> /ul'tr* D M A/ (Or "Ultra DMA", "UDMA", "Ultra-ATA",
"Ultra-DMA/33") A development of the Advanced Technology Attachment
specifications which gives nearly twice the maximum transfer speed 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
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
Developed by Quantum Corporation, ATA-4 has been freely licensed to
manufacturers and is supported by Intel Corporation.
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Computer » Atanasoff, John Vincent » ATAPI