External drive on iOS 13: This Accessory requires too much power

With the newest version of Apple’s mobile operating system, iOS 13, you can now easily connect external hard drives (e.g. USB thumbdrive, keyboard, mouse) and manage files directly from your iPad or iPhone.

If you are using an adapter cable to connect a USB hard drive to your iOS device, you may be greeted with either of the following error messages:

Cannot Use Accessory

USB Flash Drive: This accessory requires too much power

Or:

Cannot Use Device

The connected device requires too much power

Why do I see this error message?

This error message is shown because your external device you are trying to connect requires power in order to function properly. The Lightening or USB-C port on your iPhone or iPad only will make a limited amount of power available to external devices. The error means that the external device you are trying to connect requires mores power than your Apple device can give: the maximum is 100mAh.

This is a simple Lightening to USB from Apple. It will only allow you to connect simple devices to your iPhone or iPad.

Troubleshooting

If the error message keeps popping up on your device, you may try to perform some actions first in order to resolve the issue.

Best thing to do is to first disconnect all cables that are plugged in. Plug in the adapter cable again, then connect the external device. Make sure each cable is connected firmly so that there is no weak or interrupted connection.

Another option you may try is to reboot your iPhone/iPad/iPod, both with and without the adapter cable connected.

A third option is to make sure your Apple device is fully charged.

Alternative options

Try another device

If you are still having trouble with the error pop-up, there are still some options to try out. First, you may check if the same error is shown on another iOS device.

Or, try another external device. Another USB thumb drive or external hard drive may work perfectly.

The last option here is to try a totally different device: more concretely, a very ‘simple’ device such as a keyboard. If the keyboard (which is a simple device and doesn’t need much power generally speaking) is working fine, it is likely you should keep reading.

Use a an adapter with a power supply

The last option remaining and your best option you have is to use a OTG adapter that has an additional power supply port available. This means that there are two ports in total: a data transfer port for your external device, and a power port (which will both provide additional power to the external device, and it will charge your iOS device).

Lightening to USB 3 adapter from Apple. Not only does it allow for faster transfer speeds, it will also allow you to connect external devices that require a lot of power (notably external hard drives).j

Thanks to the external power source, the external device you connect can now draw up to 500mAh, which is 5 times as much without extra power source.

 

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12 thoughts on “External drive on iOS 13: This Accessory requires too much power

  1. Pingback: Transfer video files from Windows computer to iPad without iTunes | Thomas' Miniblog
  2. What a disappointment! I’ve just tried four different USB memory sticks (including quality, branded Sony and Sandisk drives and a USB 2.0 device) with a powered USB adaptor (the “best option”) and all of them have returned the message “this accessory requires too much power”. I even made sure that the powered adaptor was charging the iPad first. I’m using a 2017 iPad Pro 9.7”, for this.

    I’ve heard rumours that USB adaptors from 3rd party manufacturers (this one was bought on eBay) are sometimes not fully compatible but, before I go to the expense of an Apple-branded adaptor, I’d like to be sure that I’ll get a better result from doing that. What are other people’s experiences?

    1. Hello,

      I just upgraded my iPad Mini 5 to 13.1.1 and receive the “not enough power” error message, even when using a genuine Apple USB adapter with the auxiliary power capability. So you can assume that buying the genuine article is not going to solve this problem, at least until Apple releases a fix (if that’s even possible).

  3. Furious…iPad Pro second gen. usb lightning camera adapter. iPadOS. SAN disk cruzer blade requires too much power error despite being powered through lightning port. What a bunch of total crap

  4. I purchased the original Apple ‘Lightning to USB 3 adapter’ and have it powered by an iPad charger. The result is that I no longer get the error messages but whatever I stick into it is apparently not recognised as nothing happens. What do I miss here?

  5. Ok, I had the same issue. Found a work around. I have a generic ebay USB Lightning adapter with USB, SD and MicroSD.
    The “trick” I found was to attach the lightning power to the device and have it plugged in, then attach a non-powered USB hub to the USB port. Plug in your USB device (usb keys, keyboard etc) and for me it worked.

    Hope this helps someone.

  6. the other fix I have found, so far, is that it will take things off an SD card with the Lightning-SD card reader. Of course, it’s another stupid connector…

  7. Ok now I’m kind of excited. I kinda fixed it!

    I tried using the original AC adaptor with my usb3 adaptor. now it works! But kind of crazy I would need that much power for a thumb drive. The USB hub I was using wasn’t cutting it. But my iphone SE can read the same device without any assistance.

    iphone. SE.

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