macbook pro volume could not be unmounted

Both solutions work alongside each other. I definitely recommend to start with approach #1 if you can.

Unfortunate for me, I had to go down the road of the 2nd approach.īut fortunate for you, because I can explain you here both approaches. HFS – the “oh f*ck” case: a more complex, technical solution.

HFS+ Plus – best case: a simple and well supported solution.

% diskutil listģ: > Apple_HFS <<<< 653.5 MB disk3s1s2īut for sure you can somehow teach macOS Catalina the ancient language of «HFS» – Apple’s own Hierarchical File System format – right?īringing back HFS support to macOS comes in 2 variations:

If you think the volume is supported but damaged, try the 'readOnly' optionīy inspecting the technical details of the disk lead me to a clue, that the old – in the meantime unsupported – Apple_HFS format may be the issue. So I wanted to backup an old DVD disc digitally in macOS Catalina, but to my surprise it was not mountable using Disk Utility – only showing the error: Could not mount ( error 49153)Īnd by using the following Terminal.app command it did not work either, not giving more clues about the underlaying error unfortunately: % diskutil mount disk3s1s2

Macbook pro volume could not be unmounted