Before I forget - I require to check how much used/free storage space there is on a DVD disc. Is there any utility that already exists and can report that number (say, in sectors or bytes) simply without the need to parse complete output from dvd+rw-mediainfo and figure out track info (etc...)?
No. But it might worth throwing extra line to dvd+rw-mediainfo output... Something to consider for next update:-) A.