recordingto 650 or 700 MB discs

[jimmy bean]

Let's say I want to record 650 MB of data to both 650 and 700 MB discs. The 650 MB of data will obviously fill up the 650 MB disc, but what about the 700 MB disc? Will it be stored in the first 650 MB leaving the remaining 50 MB free (on the outer fringes), or will the first 50 MB be left free and the next 650 MB used?

Another question: Will one year old home or car MP3 players have a problem with reading the 700 MB discs, because the data tracks are closer to each other and therefore do not follow the CD Red Book Standard?