USB physical ports
patrickhess at gmx.net
Fri Sep 11 13:48:32 UTC 2015
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.
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