Original link https://blog.csdn.net/weiyoushi4001/article/details/102928575
After this mac upgrade the system, I found that my / data directory is gone, so I execute the command:
mkdir /data
The results found that actually prompted me to Read-Only filesystem, even with the sudo useless
to find relevant information when I looked a solution (closed SIP, and then enter sudo mount -uw /, create a folder to add permissions, SIP finally enabled) specific steps are as follows:
1, MAC restart, hold the Command + R, until the system into a safe mode.
2. Select an account, then click on the tool bar at the top of the screen to find the command-line tool.
3, execute the command csrutil disable
4, restart the computer, do not enter safe mode, execute the command sudo Mount -uw /
5, execute the command sudo mkdir / the Data
6. Run the sudo the chmod 777 / Data
. 7, restart the computer, enter the safe mode, Run csrutil enable (open SIP)