If you put them into a regular or CD-R drive, they will be unusable. These are the same size as a CD, but hold about 7 times as much. Mostly used for movies today and the drives are just players. The latest drives combine CD-RW and DVD which will write CD's and play DVD's. The computer knows how to transfer data from one place to another because of giving each component a name.
Computer names are real simple.
Some defaults are preset by a program and cannot be changed. Other defaults can be changed to an option chosen by you, the operator and will remain the new default until something or someone changes it to a new default. For example, the mouse pointer is set to a small size by Microsoft. You can change that size and the pointer will remain that size until you change it or reload Windows. A data entry field.