It's a newer CDROM filesystem standard that's required for DVD roms. It's meant to be a replacement for the ISO9660 filesystem used on today's CDROMs, but the immediate impact for most will be DVD.

I purchased a DVD writer to back up large quantities of data. Nero gives me the option of making three types of discs, as mentioned in the title (as well as DVD boot, DVD video, etc., but I don't need ...