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RedMag USB3 (mini) reader - Apple MBP drawing too much power from USB port

roryhinds

roryhinds

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Anyone else getting error messages using the RedMag Reader USB3 unit?

I'm on a MacBook Pro Retina and it keeps telling me…

"Because a USB device was drawing too much power from your computer, one or more of your USB devices has been disabled"

I'm using the supplied 5V power supply so don't know why its drawing power from the USB port.
 
Thanks Dan, Yes I tried with and without the 5V supply and get the same results on both.

Do you have info on the recall?
 
I don't have another USB3 cable to tried.
And only have the 1 x 512Gb Turbo card so can't try another capacity.

it does come up with the issue without a card in the reader though so I'm ruling out the card.

If Red have issues with these then maybe I have one that has an issue, which is pretty annoying.
 
Interesting. I face a somewhat similar situation when I plug my nokia mobile to the USB of my macbook pro. The usb charges the mobile as well as one can download the images etc. Unfortunately, I get a message that it draws too much of power and other connected devices have to be shut down.
 
There was a notice from Red a long time ago that the 512 turbo card may draw too much power, more than the usb3 spec allows for with bus power. Have to use the AC power plug, or run a usb3 power cable that pulls from more than one usb3 port, or use an external portable battery pack that provides up to 2 amps.
 
That is correct. It will sometimes mount the 512GB using just USB power but often comes up with the failure message you mentioned.

I use the USB-power cable and plug it into my iPhone charger, then use the USB3 into the MBP and it always works great.
 
roryhinds said:
I don't have another USB3 cable to tried.
And only have the 1 x 512Gb Turbo card so can't try another capacity.
it does come up with the issue without a card in the reader though so I'm ruling out the card.
Click to expand...

Yes I'd say it is related to the 512 turbo card that can draw more power than the other REDMags... strange that it does warn you even before you insert any card tho !
 
I've had this warning with a faulty cable (I assume some sort of short circuit in the cable causing excessive current draw).
 
Also be aware that iphone chargers are changing and on the new phones produce 10W and my Ipad charger that looks identical is producing 12W. My USB3 reader wad plugged into a 12V power supply by a data wrangler and it went up in smoke.
 
Tom Gleeson said:
Also be aware that iphone chargers are changing and on the new phones produce 10W and my Ipad charger that looks identical is producing 12W. My USB3 reader wad plugged into a 12V power supply by a data wrangler and it went up in smoke.
Click to expand...

A higher wattage power supply does not mean it pushes more current out, it means a device can draw more current if it needs to without the charger shutting down, overheating or the output voltage dropping below specification. If USB iPhone chargers were even 100W, but still 5V, existing iPhones would be absolutely fine using them to charge via USB cable.

However, a higher voltage power supply should definitely not be used to power devices designed for lower voltages.
USB2 and 3 require 5V power. I'm puzzled how your data wrangler even had a USB port wired up with 12Volts!
 
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