This is a question for those who know the format of a multisession DVD:
I burnt a multisession DVD with several sessions. I checked the contents after each session, all was fine.
Now while burning an additional session the computer crashed.
The result is that I can not read any session from this DVD any more.
As the average naive user I assumed that all the sessions already burnt on a DVD should be safe, even if something happens in a later session.
So my question is:
Was this an extremely unlikely incident, or is it quite normal that one session which is messed up ruins the previous sessions as well? And why is that this way or the other?