CD や DVD にファイルを書き込む
You can put files onto a blank disc by using a disc burning application, such as Brasero.
If the disc wasn’t burned properly
Sometimes the computer doesn’t record the data correctly, and you won’t be able to see the files you put onto the disc when you insert it into a computer.
In this case, try burning the disc again but use a lower burning speed, for example, 12x rather than 48x. Burning at slower speeds is more reliable.