macOS RAM Disk – Fix Permission Change Issue

hard drivemacosmemorypermission

Why can't I set root as folder owner? 

diskutil erasevolume HFS+ "VTest" $(hdiutil attach -nomount ram://1165430)
cd /Volumes/VTest/
mkdir TDir
sudo chown root:wheel TDir/
ls -l
drwxr-xr-x  2 user  staff  68  7 янв 16:06 TDir

But it works fine for folders on any other drive(physical)

Best Answer

Creating a RAM disk this way disables ownership. To enable ownership additionally enter:

sudo diskutil enableOwnership diskX

To add folders use sudo mkdir folder_name. The folder has root:wheel 755 permissions then, but you can change ownership to other users later.

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