Computer Dictionary/ATA-4

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/ul'tr* D M A/ (Or "Ultra DMA", "UDMA", "Ultra-ATA",

"Ultra-DMA/33") A development of the [[Computer Dictionary/Advanced Technology Attachment|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 [[Computer Dictionary/Intel Corporation|Intel Corporation]].

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