Reasons for unresponsive external U disk:
(1) Apple mobile phones do not support external U disks used by ordinary computers.
(2) The interface of Apple mobile phone is not USB2.0, and it cannot read any information from the USB flash drive.
(3) The USB flash drive used in the computer does not have an OTG conversion device certified by Apple.
(4) The external device manager is not opened on the Apple phone.
Currently, Apple can use an ibridge external memory as an external USB flash drive.
Introduction to iBridge external memory:
iBridge is simply an external memory. Although its function seems to be the same as that of an ordinary USB flash drive, it has functions for both iPhone and iPad. As well as the Mac's ability to add additional storage. Not only that, the design of iBridge is unique.
Its appearance is similar to an oval bracelet, but because the device is equipped with both Lightning and USB connectors, its design cross-section transitions from narrow to wide. When enabled at the same time, with the help of the J-shaped design of the two connectors, iBridge can be directly connected to an iPhone or iPad for expanded storage, or it can be connected to a desktop device for transfer storage at the same time.