USB 2.0 and 3.0

Will devices such as thumb drives shown as USB 3.0 work with a USB 2.0
equipped computer?

Thanks

On Sat, 23 Jul 2011 15:15:40 -0400, "jkneese" <>
wrote:

>Will devices such as thumb drives shown as USB 3.0 work with a USB 2.0
>equipped computer?

Every one of the USB 3.0 flash drives that I've seen advertised, and
the Adata brand one that I own say that they are backwardly
compatible.

Kirk Bubul <> wrote in
news::

> On Sat, 23 Jul 2011 15:15:40 -0400, "jkneese" <>
> wrote:
>
>>Will devices such as thumb drives shown as USB 3.0 work with a USB 2.0
>>equipped computer?
>
> Every one of the USB 3.0 flash drives that I've seen advertised, and
> the Adata brand one that I own say that they are backwardly
> compatible.
>

I have a Verbatim external HD, USB 3.0, which works with USB 2.0.

jkneese wrote:
> Will devices such as thumb drives shown as USB 3.0 work with a USB 2.0
> equipped computer?
>
> Thanks
>
>

The USB3 standard, refers to the architecture as "dual bus".
That implies both interfaces are always present.

(You don't have to download this "package", but it's available.)

http://www.usb.org/developers/docs/u...pec_071311.zip

The standard also says only one bus operates at a time, so they're
not intended to be running as in USB2 + USB3. Both busses are
available, and via negotiation, the highest speed one available
will be used. If there was a pin broken on one of the interfaces,
I presume the device will still function with the remaining
interface. (If the broken pin affected the availability of
power, that would be a different matter.)

Paul

All modern USB 3.0 Devices are backward comptable with USB 2.0 ports.
it will just run at the USB 2.0 speeds and USB 1.0 speed if its a really old
pc.


--
AL'S COMPUTERS
"jkneese" <> wrote in message
news:j0f6kp$v2e$...
> Will devices such as thumb drives shown as USB 3.0 work with a USB 2.0
> equipped computer?
>
> Thanks
>
>

In article <>,
Andy <> wrote:
>All modern USB 3.0 Devices are backward comptable with USB 2.0 ports.

Are there non-modern USB 3.0 devices?
;-)

On 26/07/2011 22:50, Mike S. wrote:
> In article<>,
> Andy<> wrote:
>> All modern USB 3.0 Devices are backward comptable with USB 2.0 ports.
>
> Are there non-modern USB 3.0 devices?
> ;-)

I believe various USB3 devices *were* manufactured in the year 2000 or
our Lord but were later discontinued due to lack of computers with USB3
ports! ;-)
-- choro --

Actually there are a few that aren't backward compatible VERY few

--
AL'S COMPUTERS
"Mike S." <> wrote in message
news:j0ncqs$hdb$...
>
> In article <>,
> Andy <> wrote:
>>All modern USB 3.0 Devices are backward comptable with USB 2.0 ports.
>
> Are there non-modern USB 3.0 devices?
> ;-)
>

You would be correct.


--
AL'S COMPUTERS
"choro" <> wrote in message
news:37HXp.79249$2...
>
> On 26/07/2011 22:50, Mike S. wrote:
>> In article<>,
>> Andy<> wrote:
>>> All modern USB 3.0 Devices are backward comptable with USB 2.0 ports.
>>
>> Are there non-modern USB 3.0 devices?
>> ;-)
>
> I believe various USB3 devices *were* manufactured in the year 2000 or our
> Lord but were later discontinued due to lack of computers with USB3 ports!
> ;-)
> -- choro --
>