Meaning of ATA-4
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 Computing Dictionary |
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| | Definition: | | /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 33This 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. |
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