The command /sbin/mount -uw /
no longer works after I upgraded to Catalina. I've read that this is due to Apple. Is there a new solution to mount to read and write through Single User Mode?
Mac OS Catalina – Unable to Mount Read-Write in Single User Mode
catalinamacosmountsingle-user
Best Answer
Catalina uses a new split-volume system for its file system, where system files are stored on a read-only volume, and user-modifiable parts of the filesystem are stored in a separate "Data" volume that's normally mounted read-write (see this article for more info). But in single-user mode they're both mounted read-only.
If you just need write access to the normally-writable parts of the filesystem, you just have to update the mount point for that volume:
If you need write access to the normally-read-only volume, things are more complicated. You'll need to:
csrutil enable --without fs
(see my answer here)mount -uw /
and maybe alsomount -uw /System/Volumes/Data
csrutil enable
to get the normal system protections back.