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For the time being, SATA can't go faster than ATA/133 in -most- systems - because even though SATA's controller-to-disk speed is 150 mbytes/sec, a 32-bit, 33MHz PCI slot is only CAPABLE of 132mbytes/sec throughput!
If you have server grade hardware and are using, for example, a 3Ware 8500 series controller which is a 64-bit 66MHz card...you're going to get all kinds of performance out of it...even though Adaptec accuses 3Ware of not using 'native SATA' ASICs...
At work we've started playing with Raptor drives on 3Ware and on-board controllers and they haul azz...but SCSI is still king when it comes to high performance under heavy load.
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