Once the disk not readable error is encountered, how to fix this problem? How to fix 'The disk you inserted is not readable by this computer' on Mac Most of the time, this issue happens on macOS, but it also occurs on Mac OS X with a different message ' The disk is unreadable by this computer, do you want to initialize the disk?'. While others say this unreadable disk error only appears with one external drive. Some affected users report the issue occurs with every external drive. While macOS Big Sur users are receiving the different error: 'The disk you attached was not readable by this computer' with Eject, Ingore and Initialize button.

Some users are experiencing ' The disk you inserted was not readable by this computer with Initialize, Ignore and Eject button' error when connecting an external hard drive, SD card, USB flash drive to their Macs with macOS Big Sur, Catalina, Mojave or High Sierra installed.