"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
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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