Disable/hide unmount button for internal disks
Use cases
In cases where user has multiple internal disks, and still wants Nautilus to show those separate disks for easy navigation.
Desired behavior
Remove the unmount option for additional internal disks. The following screenshot is from the "Other Locations" section in Nautilus.
Benefits of the solution
Prevents accidental unmounting of internal disks that cannot be physically "unmounted" like USB drives. Users can still unmount the drive if necessary through GNOME Disks, and of course via the terminal.
Possible drawbacks
Makes it slightly more difficult to unmount an internal disk when necessary, but as mentioned above, there are already solutions for this. GNOME Disks and the terminal will still be able to unmount said additional internal disks.
This has been an issue for a while. See the following StackExchange question: https://superuser.com/questions/973770/how-can-i-disable-the-unmount-option-for-my-second-internal-harddisk-in-ubuntu