Answer by djmoore711 · Aug 31, 2010 at 06:22 AM
The ATA technology has had a chain of adaptations, each one gaining speed and robustness. Ultra ATA used Ultra DMA to help speed up HDD to memory transactions, which frees up the CPU to do more important tasks.
It had its first big breakthrough with the ATA-4 style. It's now capable of 133MB/s, but requires a 80 pin IDE ribbon, compared to the older 40 pin IDE ribbon.
Todays SATA and SCSI are much, much faster than this. Ultra-SCSI can now do 360Mb/s and SATA can do up to 6Gb/s!
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