I have this portable hard disk with 4 partitions. When I need to safely remove the device I have to unmount each partition manually. Is there a way I can unmount all at once? Or is it suffice to unmount one partition only and remove the disk?
If you know the device file, say /dev/sdb, you can unmount all partitions of the device with the command:
By the way, I think that the gnome right click menu item "Safely remove" is the graphical best way to operate.