找到了这个解释 原来是 10.15 干的 但 10.15 为什要分两个区 当时用 mac 就是看中了 mac 不用分区 这不是历史的倒退吗 感觉很不爽
New Read-Only Filesystem Partition. User data is stored on the 2nd partition “ Macintosh HD — Data ”. MacOS Catalina runs in a dedicated, read-only system volume — which means it is completely separate from all other data, and nothing can overwrite your critical operating system files.
NOTE: The Macintosh HD Read Only Partition is writeable in Beta 1!!!
If you want to enable read only you have to place a file in the root of the drive.
sudo touch /.rootro
Then reboot to enable read-only mode.
Verify by trying to create /.rootro2
sudo touch /.rootro2
You should get touch /.rootro2: Read-Only file system
@
minamike