Can it really be correct that SATA is only 20% faster than an external USB3 disk?
Or are there some latencies that kills the USB3, and therefore make it unattractive?
migrated from serverfault.com Jul 12 '12 at 4:24
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Even that, though, is far faster than what a single drive is likely to be able to manage.
USB3 does also move from half-duplex to full-duplex communication, so that should improve latency significantly over USB2.
My guess is that if you're talking about a single drive on each bus, you wouldn't see a lot of difference between them. But that's just theoretical and based on my limited understanding of USB.