different ways of writing to the disk for one, TAO(track at once), DAO(disk at once), and different filesystems on the disk itself, for example a VCD isnt an iso9660 file format but most drives can read and write that way in DAO mode
edit:
even a music CD format is different than an iso9660 data format or VCD format, it makes a difference when it comes to the total amount of actual data you can put on the disk itself, some filesystems take up more space leaving less space for the actual data
edit:
even a music CD format is different than an iso9660 data format or VCD format, it makes a difference when it comes to the total amount of actual data you can put on the disk itself, some filesystems take up more space leaving less space for the actual data
