Why can’t I edit my external hard drive on Mac?
How to fix hard drive read-only issue
- With the drive plugged into your Mac, go to Applications > Utilities and launch Disk Utility.
- Choose the external disk in the Disk Utility sidebar.
- Select the Erase tab.
- Type in a name for the reformatted drive.
- Select MacOS Extended (Journaled) from the dropdown menu.
- Press Erase.