Channels in the 70's are the original locations. These are being phased out to map them directly with the Non-HD channel. Nobody really knows when they will go away, but I just set up a Favorites list and eliminated the 70s.
No its not! These are still here for the Mpeg2 HD customers,who haven't upgraded to the new HR-20 -21 or H20-21.It is a software glitch, D* told me they were working on a fix.