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HandyMac

macrumors member
Original poster
Sep 27, 2014
62
10
I'm just starting to work with Catalina, installed it fresh on my spare MacBook Pro (along with Sierra and Mojave on other partitions). I've also installed it (and the other OSes) on an external drive.

I've run into a strange problem: The main window (root directory) of the MacOS Catalina drive is locked (cannot be modified) when it is the startup drive. I like to arrange the folders (System, Library, Applications, Users) in a custom setup, but I can't. They're all in a row alphabetically, and cannot be moved.

If I pick one up and try to move it, a prohibited glyph appears on it, and it snaps back to where it was. If I move the edge of the window to make it narrower, the icons stay where they are so one disappears, rather than rearranging themselves so they're all still visible. I can't copy anything into the window, nor delete anything to the Trash (of course I'm not deleting the 4 official folders, but something else that's been added – which can be done when the Catalina drive is not the startup drive).

However, with a Catalina drive that is not the startup drive, I can do all these things.

If the System asked for authentication to modify the window, say to copy something into the window – as happens with a Mojave or Sierra startup drive – that would make sense. But it simply prevents the action, without explanation. Is this a new "feature" in Catalina? Is there a way to turn it off?
 
With Catalina the boot container is split into 2 volumes, the OS volume which is write only and a data volume which is read/write. You would need to disable SIP in the recovery mode to be able to do what you want to do. Be careful though with what you do with the read only volume.
 
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Thanks for the response. I had seen that the Catalina volume somehow turns into 2 volumes when the computer is started from another System, but I didn't know that one is read-only. Somebody referred me to About the read-only system volume in macOS Catalina - Apple Support which clarifies the situation somewhat. Still have to figure out how to copy items to the Catalina volume when started from another System. (The OS volume becomes writable in that case, which is probably not a good idea.)
 
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