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USB 2 device plug into USB 3 port?


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#1 Hal06

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Posted 29 June 2014 - 06:39 AM

Can a device with a USB 2 (or 1) plug into a USB 3 port?



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#2 JohnC_21

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Posted 29 June 2014 - 07:23 AM

If you are talking about Tyoe "A" plugs then yes, they are forward and backward compatible. You can plug a USB2 into a USB3 and a USB3 into a USB2. Also a 1.1.

 

http://pcsupport.about.com/od/insidethepc/a/usb-compatibility.htm



#3 Hal06

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Posted 29 June 2014 - 07:44 AM

Thanks.



#4 Platypus

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Posted 29 June 2014 - 07:51 AM

Note that since a USB 3 port can potentially supply more current than USB 2 can, if a USB 3 device is port powered, then on a USB 2 port it can only draw USB 2 level of current (up to 500mA) . Not all USB 3 port powered devices need the extra current, so those that do not would operate but only at USB 2 speed. A port powered USB 3 device would not be able to run from USB 2 if it needed more current than can be supplied by the port.


Edited by Platypus, 29 June 2014 - 07:53 AM.

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#5 JohnC_21

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Posted 29 June 2014 - 08:21 AM

Platypus made a very good point. I have a USB3.0 portable hard drive that runs fine on a USB2.0 port but some devices may draw more power than a USB2.0 port can provide. In those cases you can use a Y-cable with 2 type A plugs. Plugging both into 2 USB2.0 ports would give you enough power.

 

220px-Y-shaped_USB_3.0_cable.jpg


Edited by JohnC_21, 29 June 2014 - 08:23 AM.


#6 Platypus

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Posted 29 June 2014 - 08:27 AM

Yes, that can be a very useful device!


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#7 OldPhil

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Posted 29 June 2014 - 11:10 AM

My USB 2 key board would intermittently not work when it was in the 3 port, a reboot would fix it most times.  Then in rechecking my back panel connections I moved it to a 2 port and have -0- issues since, so now I look before blindly stuff it in a port.


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