Efallai nad oes ganddoch caniatadau i ddi- ymgychwyn ("unmount") y dyfais. Ar gysodau Unix, y rhan fwyaf o' r amser mae angen hawliau gwasanaethydd cysawd i ddi- ymgychwyn dyfais.
You may not have permissions to uninitialize ("unmount") the device. On UNIX systems, system administrator privileges are often required to uninitialize a device.