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gagle
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PiHub usb 3.0

Mon Jun 23, 2014 4:37 pm

I have a PiHub and I need to buy an external HDD usb 3.0. Can I connect the hdd directly to the pihub or I need to buy a usb 3.0 -> 2.0 adapter?

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AndrewS
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Re: PiHub usb 3.0

Mon Jun 23, 2014 4:46 pm

There's no such thing as a USB 3.0 -> USB 2.0 adapter ;)
USB3.0 is backwards-compatible with USB2.0, USB1.1 and USB1.0
USB2.0 is backwards-compatible with USB1.1 and USB1.0
USB1.1 is backwards-compatible with USB1.0


Yes, you can just plug in your HDD (but you'll only get USB2 speeds, not USB3 speeds).

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gagle
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Re: PiHub usb 3.0

Mon Jun 23, 2014 4:52 pm

Are you 100% sure? do you have an external usb3.0 connected directly to the hub?

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AndrewS
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Re: PiHub usb 3.0

Mon Jun 23, 2014 5:05 pm

No, I don't have a USB3.0 external HDD.
But see http://en.wikipedia.org/wiki/USB#USB_3.0

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Jessie
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Re: PiHub usb 3.0

Mon Jun 23, 2014 5:15 pm

Usb 3.0 plugs are backwards compatable. They were designed that way. They have an extra set of pins that dont make contact with 2.0 hubs and devices. I have plugged a 3T Usb 3.0 Seagate drive formatted EXT4 to a R Pi and it was recognized fine.

Also had you searched these forms you would have found this has been answered many times and as soon as last week.

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gagle
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Re: PiHub usb 3.0

Mon Jun 23, 2014 7:17 pm

ok, thanks

markatlnk
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Re: PiHub usb 3.0

Tue Jun 24, 2014 2:15 pm

I am running a USB3 drive with a USB3 (ANKER 7 port) hub, yes you only will get USB2 speed, but the power supply in the hub is much better than some of the cheaper 2.0 hubs. The down side is slow USB1.1 devices such as keyboards or FT232 serial devices can not be plugged directly in to the USB3 hub. But you can plug a cheap 2.0 hub into the USB3 hub then plug in the 1.1 devices.

The 3.0 hub also powers the Pi and other things. Plugging in another hard drive doesn't reboot the Pi like it did on cheaper hubs.

Mark

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