From Deewee

Indicates the physical or digital format in which a product is presented, such as "Hardback", "Paperback", "DVD", "Blu‑ray", "Vinyl", or other media types. The value may contain multiple comma‑separated items to represent combined attributes (e.g., "Hardback, Illustrated").

The total count of individual discs included in the product package or media collection. It indicates how many separate physical discs are provided, such as DVDs, Blu‑Ray discs, or CD‑ROMs. The value is a whole number and can be used to determine storage capacity, packaging size, or media quantity for inventory and shipping purposes.