Date: Fri, 11 Sep 2015 15:48:21 +0200 From: Patrick Hess <patrickhess@gmx.net> To: freebsd-questions@freebsd.org Subject: Re: USB physical ports Message-ID: <4365924.Nes7SDDcRu@desk8.phess.net> In-Reply-To: <55F2C469.4030101@hiwaay.net> References: <55F1A507.70402@gmail.com> <55F2C335.3030304@gmail.com> <55F2C469.4030101@hiwaay.net>
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William A. Mahaffey III wrote: > On 09/11/15 07:10, Ernie Luzar wrote: > > But the real question is why is Freebsd USB rates capped at 20Mbps > > when the hardware says it's capable of 480Mbps? > > I think you are confusing bits & bytes. 480 Mbps = 60 MBps, lower case > 'b' is bits, upper case 'B' is bytes, 8b / B (8b per B). That's the first reason. In addition, just because the bus is capable of transmitting up to 480 Mb/s, that doesn't mean the devices connected to that bus will also be able to process data at that rate. As a matter of fact, most el-cheapo USB thumb drives won't. Try that again with a modern HDD or even an SSD and you'll get much better results. Patrick
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