External Media - Disallow
When enabled, prevents storage volumes identified as external disks from mounting.
- Users connecting a password-encrypted drive may still see an error message during the mount attempt letting them know the disk cannot be accessed.
External Media - Read only
When enabled, prevents storage volumes identified as external disks from being written to. All external drives will mount with read-only privileges.
- Can also be configured for disk images, network disks, or optical media
- These MDM payloads are marked as deprecated by Apple and may be retired in a future version of macOS