I just got a new MacBook Air, and went to save a document, on the root level of the drive. It said I don't have permission to do so. It WILL let me save to the Documents folder. Never heard of such a thing. When I went to GET INFO on the "Macintosh HD" it said I had READ and WRITE permission.
So I am trying to figure out what is going on. It also won't let me create a folder at the root level.
Any help appreciated.
You will probably want to migrate to and use Linux or BSD here and not macOS, if you need this sort of access.
macOS will block these efforts, and will prevent modifications to storage outside of specific areas of the file system.
Best keep your files in the /Users directories, and in /usr/local, and in some other pre-designated places on the boot device.
The file system root is not one of these places.
For an intro: About System Integrity Protection on your Mac - Apple Support
Saving to Internal Drive on MacBook Air?
