OTG Cable and external drives

Til

Hello everyone,
I noticed that the USB OTG cable in the shop has an additional USB A plug. Why is that?

Is this needed to supply enough power to whatever device may be connected there?

I'm thinking about combining my UpBoard with a small 2x2.5" RAID (fanless!) like this
http://www.silverstonetek.com/product.php?pid=506

So could I use an 3.0 micro-B > 3.0 micro-B cable to use this RAID with the UpBoard?

And would I need an extra power supply for the RAID in this case?
(Vendor: "USB bus powered included (Support up to 5V/3A), no adapter required" <-- is this realistic for the UpBoards OTG port?)

DCleri

Hi Azimoth,

the USB type A extra cable is meant to provide extra power but I would strongly suggest to use an external source in case you are planning to support a raid configuration over USB3.0

Looking at the box you linked here, the best choice would be the Micro to Micro USB3.0 ports, to avoid additional cables and adapters which may affect performance and reliability: http://up-shop.org/up-peripherals/56-usb30-microb-to-microb-cable.html