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meaning the controller then needs different outlets for 3.0 and 2.0 cables, |
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so I need to use 3.0 cable on the 3.0 one, but 2.0 cable on the other. |
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sounds reasonable. |
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|
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thanks |
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|
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michael |
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|
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-- |
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Michael Scherer |
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Univ.klinik f. Psychiatrie |
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email: michael.scherer@×××××××××××××.at |
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phone: +43 6991 941 22 54 |
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|
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----- Original Message ----- |
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From: "Paul Hartman" <paul.hartman+gentoo@×××××.com> |
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To: <gentoo-amd64@l.g.o> |
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Sent: Monday, 07 May, 2012 23:45 |
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Subject: Re: [gentoo-amd64] Drivers For USB HDD |
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|
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|
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> On Mon, May 7, 2012 at 4:18 PM, Michael Scherer |
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> <a6702894@××××××××××××××.at> wrote: |
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>>> On Mon, May 7, 2012 at 8:21 AM, Paul Hartman |
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>>> <paul.hartman+gentoo@×××××.com> wrote: |
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>>>> |
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>>>> On Mon, May 7, 2012 at 10:00 AM, Mark Knecht <markknecht@×××××.com> |
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>>>> wrote: |
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>>>>> |
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>>>>> here are 3 or now I |
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>>>>> think 4 different USB specs - EHCI, OHCI, UHCI, and then whatever USB |
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>>>>> 3.0 is using |
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>>>> |
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>>>> |
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>>>> XHCI |
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>>>> |
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>>>> Furthermore, USB 3.0 has 9-pin ports and cables (for type-A) versus |
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>>>> the 4-pin of USB 1/2. The USB 3.0 sockets are backward-compatible with |
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>>>> older USB devices and cables, but older USB cables are not |
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>>>> forward-compatible with USB 3.0. |
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>>>> |
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>>> |
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>>> Good point. None of my USB 2.0 drives work in my USB 3.0 port. I do |
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>>> have a USB 3.0 drivers, supposedly, and one drive that claims to be |
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>>> eSata/USB 3.0 compatible, but I've not tried to get it working using |
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>>> USB 3.0. |
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>>> |
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>>> - Mark |
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>>> |
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>>> |
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>> |
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> |
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>> Seems this either a typo, or a contradiction: |
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>> "The USB 3.0 sockets are backward-compatible with older ... cables" |
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>> would mean I can use the old cables for 3.0, but then |
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>> |
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>> "but older USB cables are not forward-compatible with USB 3.0" |
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>> says I can NOT use the old cables. |
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>> I have no 3.0, but some day I probably will, so I'd like to know what |
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>> exactly you mean. |
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>> |
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>> kind regards |
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>> |
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>> michael |
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> |
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> Hi, |
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> |
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> Here is what I mean: |
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> |
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> USB 3.0 socket is backwards compatible = USB 2.0 cable and devices |
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> still work as USB 2.0 when plugged into USB 3.0 port. |
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> |
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> USB 2.0 cable is not forward-compatible = you can not use USB 2.0 |
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> cable with USB 3.0 device as USB 3.0. It will only behave as USB 2.0 |
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> in that case. |
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> |
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> If you want to truly use USB 3.0 you need to have all three: USB 3.0 |
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> port, USB 3.0 cable, USB 3.0 device. |
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> |
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> |
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