Every time that I need to use a Flash USB drive, SD card or a HDD I must format it and create a partition before using it, such as NTFS, FAT, FAT32, etc. So this makes me raise some doubts:
Why don't I need to do the same with CDs and DVDs?
Operating systems usually do it before burning media without warning me?
What is the file system typically used on CDs and DVDs?
Could I create two or more partitions inside the same DVD?