USB 2.0 and 3.0

[jkneese]

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

Thanks

 

[Kirk Bubul]

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.

 

[bd]

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.

 

[Paul]

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/usb_30_spec_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

 

[Andy]

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.

 

[Mike S.]

All modern USB 3.0 Devices are backward comptable with USB 2.0 ports.

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

 

[choro]

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 --

 

[Andy]

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

 

[Andy]

You would be correct.


--
AL'S COMPUTERS

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 --