<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.
(1998-09-30)
Nearby terms:
AT-3 « ATA « ATA-2 « ATA-4 » Atanasoff-Berry Computer » Atanasoff, John Vincent » ATAPI
