Thanks, Jon.
What I missed there (actually, there is another link in that article) is that for restoring the system, or repair disk with DU one can boot into a hidden partition that Lion now creates, and which is called recovery HD. It is accessed by pressing the Option Key after a restart chime. Very neat.


Alex
3.1 GHz 13" MacBook Pro 2015, 8 GB RAM, OS 10.11.2, Office 2011, TimeWarner Cable
2.8 GHz Xeon Mac Pro 2010, 16 GB RAM, OS 10.11.2, Office 2011, LAN