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?
This question came from our site for professional system and network administrators.
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.