Does USB 2.0 protocol in lightning port limits the speed of files copying from card reader to external drive via usb hub?

Hi Thomas,

The article Connect external storage devices to iPhone outlines the requirements to accessing other storage media using the Files app on your device. As the process you're describing is not listed on that page as a supported option, it would not be possible to predict exact speeds you should expect to see. If the iPhone is being used to manage the transfer, it's possible that the files would need to pass through the iPhone memory before they are written to the final destination.

Regards.

The speed will be USB 2.0 from the Lightning port on the iPhone to another device. If you have already copied files from the phone to a card reader with USB 3.0 capability and the external drive has 3.0 capability, then the transfer from the card reader to the external will occur at 3.0 speeds.

If you were copying files from the iPhone directly to a Mac or external drive, then the speed of the transfer would be USB 2.0 regardless of the capability of the Mac or external.