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Linux.com: Ultra DMA 66

Jun 28, 2000, 12:47 (9 Talkback[s])
(Other stories by Brian Richardson)


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"Have a look at the some of the newly released Linux distributions, such as Linux-Mandrake 7.1 or SuSE Linux 6.4. They all have native support for Ultra DMA 66 (also known as "Ultra ATA/66" or "UDMA/66"). What is UDMA/66? Will your system support UDMA/66? Never fear, Brian's here!"

"UDMA/66 is an extension of the ATAPI specification for devices which attach to an IDE controller. Currently there are five supported Ultra DMA modes (numbered 0 to 4). The higher mode number designates a faster data transfer between the controller and the drive. Transfer rates are commonly measures in Megabytes per second (MB/s)."

"Mode 0 and Mode 1 transfer data at 16.6 MB/s and 25 MB/s, respectively. UDMA/33, which is on most every computer made in the past few years, is Ultra DMA Mode 2 -- this transfers data at 33.3 MB/s. Mode 3 transfers at 44.4 MB/s. Mode 4 is UDMA/66, which moves data at 66.6 MB/s. Any controller or drive that supports a higher mode (say Mode 4) will also support any lower mode, so older drives still work with newer controllers, and newer drives work with older controllers."

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