UDMA ==>

ATA-4

<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
		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.

Last updated: 1998-09-30

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Nearby terms: AT-3 « ATA « ATA-2 « ATA-4 » Atanasoff-Berry Computer » Atanasoff, John Vincent » ATAPI


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