Gentoo Archives: gentoo-amd64

From: Michael Scherer <a6702894@××××××××××××××.at>
To: gentoo-amd64@l.g.o
Subject: Re: [gentoo-amd64] Drivers For USB HDD
Date: Tue, 08 May 2012 00:06:45
Message-Id: E33C593A3AB44CA683864D0149CDE93A@mic2
In Reply to: Re: [gentoo-amd64] Drivers For USB HDD by Paul Hartman
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.
sounds reasonable.

thanks

michael

-- 
Michael Scherer
Univ.klinik f. Psychiatrie
email: michael.scherer@×××××××××××××.at
phone: +43 6991 941 22 54

----- Original Message ----- 
From: "Paul Hartman" <paul.hartman+gentoo@×××××.com>
To: <gentoo-amd64@l.g.o>
Sent: Monday, 07 May, 2012 23:45
Subject: Re: [gentoo-amd64] Drivers For USB HDD


> On Mon, May 7, 2012 at 4:18 PM, Michael Scherer > <a6702894@××××××××××××××.at> wrote: >>> On Mon, May 7, 2012 at 8:21 AM, Paul Hartman >>> <paul.hartman+gentoo@×××××.com> wrote: >>>> >>>> On Mon, May 7, 2012 at 10:00 AM, Mark Knecht <markknecht@×××××.com> >>>> wrote: >>>>> >>>>> here are 3 or now I >>>>> think 4 different USB specs - EHCI, OHCI, UHCI, and then whatever USB >>>>> 3.0 is using >>>> >>>> >>>> XHCI >>>> >>>> Furthermore, USB 3.0 has 9-pin ports and cables (for type-A) versus >>>> the 4-pin of USB 1/2. The USB 3.0 sockets are backward-compatible with >>>> older USB devices and cables, but older USB cables are not >>>> forward-compatible with USB 3.0. >>>> >>> >>> Good point. None of my USB 2.0 drives work in my USB 3.0 port. I do >>> have a USB 3.0 drivers, supposedly, and one drive that claims to be >>> eSata/USB 3.0 compatible, but I've not tried to get it working using >>> USB 3.0. >>> >>> - Mark >>> >>> >> > >> Seems this either a typo, or a contradiction: >> "The USB 3.0 sockets are backward-compatible with older ... cables" >> would mean I can use the old cables for 3.0, but then >> >> "but older USB cables are not forward-compatible with USB 3.0" >> says I can NOT use the old cables. >> I have no 3.0, but some day I probably will, so I'd like to know what >> exactly you mean. >> >> kind regards >> >> michael > > Hi, > > Here is what I mean: > > USB 3.0 socket is backwards compatible = USB 2.0 cable and devices > still work as USB 2.0 when plugged into USB 3.0 port. > > USB 2.0 cable is not forward-compatible = you can not use USB 2.0 > cable with USB 3.0 device as USB 3.0. It will only behave as USB 2.0 > in that case. > > If you want to truly use USB 3.0 you need to have all three: USB 3.0 > port, USB 3.0 cable, USB 3.0 device. > >

Replies

Subject Author
Re: [gentoo-amd64] Drivers For USB HDD "Thomas Rösner" <thomas.roesner@××××××××××××××.de>