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c.f. bug 424647
List Archive: gentoo-amd64
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To: gentoo-amd64@g.o
From: Thomas Rösner <thomas.roesner@...>
Subject: Re: Drivers For USB HDD
Date: Tue, 08 May 2012 12:56:02 +0200
Am 07.05.2012 23:58, schrieb Michael Scherer:
> meaning the controller then needs different outlets for 3.0 and 2.0 
> cables,
> so I need to use 3.0 cable on the 3.0 one, but 2.0 cable on the other.

Not quite :). A 3.0 USB client (like a 3.0 HDD) will usually come with a 
new 3.0 USB cable with additional contacts. The client head is different 
than with a USB 2.0 cable. The master head (that plugs into the 
controller, your computer or hub) is backwards compatible - if you plug 
it into an USB 2.0 port, the additional contacts won't connect and the 
HDD will speak USB 2.0. The same goes for a 2.0 client in a 3.0 port.

So, controller side, you can plug everything into everything. Only 
client side you have a new outlet (which is good because it prevents you 
from using an old 2.0 cable and falling back to slow speed if both your 
PC and client speak USB 3.0)

Regards,
     Thomas



References:
Drivers For USB HDD
-- Frank Peters
Re: Drivers For USB HDD
-- Thomas Rösner
Re: Drivers For USB HDD
-- Frank Peters
Re: Drivers For USB HDD
-- Paul Hartman
Re: Drivers For USB HDD
-- Mark Knecht
Re: Drivers For USB HDD
-- Michael Scherer
Re: Drivers For USB HDD
-- Paul Hartman
Re: Drivers For USB HDD
-- Michael Scherer
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Updated Jun 28, 2012

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