I purchased an hi-md player, and I am looking at discs, how can I tell how much data the diffrent non 1gb discs hold? Like the 80 minutes, 74 minutes etc? Look at this page for instance, http://www.minidisco.com/Digital-Media/80-Minute-MiniDiscs I know some can hold 300mb or so, and others only 160, how do I tell em apart?