May 12, 2020, 5:28am
I have several external hard drives with different permissions on each of them. Some drives have me or system with read and write. Some drives have the group as staff or wheel as Read only or read and write. I’m not even sure what the right permissions for an external hard drive would be.
I already ran First Aid in Disk Utility and that didn’t reset the permissions.
You can easily change permissions per disk, and per user type within each disk, by choosing the drive, clicking Get Info, unlocking/authenticating then clicking settings to be changed.
On your Mac, assign permissions that allow users and groups to see or change a file, folder, or disk.
What’s stored on the drives? Is it only data (as opposed to OS/Application files)? Does everything belong to you (or if not, do you want it to)?
May 12, 2020, 8:36pm
Tried to do that but the interface doesn’t allow me to change.
May 12, 2020, 8:42pm
It’s only data and all the data belongs to me.
I found out a couple more details:
I reformatted one partition and the default permissions had user=me and group=staff.
Time machine partitions permissions get changed to user=root and group=wheel
I have not tested yet if doing a bootable clone will change the permissions to (root, wheel) I’m guessing that it does change the permissions.
Next steps are to figure out how to reset the permissions back to (username, staff) on all the data partitions without reformatting. I’m not able to change them using “Get Info”
How comfortable are you with Unix commands? chown should work, unless Apple has done things that make it not compatible…
Did you follow the instructions in the link? (Did you first click the lock icon then authenticate with your password?)
May 12, 2020, 11:28pm
You’re right, I didn’t fully read the instructions. I was able to set myself as the owner. I don’t see how to change the group from wheel to staff.
May 12, 2020, 11:29pm
I’m comfortable enough with Unix commands.
“Wheel” is a special type of Unix group and I don’t know what you’d therefore want to change or why, as long as your drives are working properly. I’d google for technical info on these permissions if you’re idly interested, otherwise you might read a quick backgrounder
here from someone with a similar question.
May 13, 2020, 3:08am
So it should be ok to leave the group as wheel? I was able to change the owner to me for the external drive.
drwxrwxr-x 8 macuser staff 340B May 12 15:47 HDD01
drwxrwxr-x 14 root wheel 544B Dec 19 02:46 HDD02
drwxrwxr-x 14 macuser wheel 544B Dec 19 02:46 HDD03
HDD01 - Partition that I reformatted and looks ok
HDD02 - What I thought was weird
HDD03 - I was able to change the permission for the owner and I’ll leave as wheel for now.
May 23, 2020, 1:40pm
I’m not sure why the owner and group got wonky.
For the pure data partitions, I wanted to rethink and consolidate data, so I repartitioned which fixed the permissions.