Blu-ray lives on as Verbatim and I-O Data pledge support with new drives and discs
Japan's market sustains Blu-ray as major manufacturers exit worldwide
You don't have to use magnetism or electrical charge to store data. It can be done using light, or more rather, the reflection of it. Okay, if you want to be really specific, it's done using the interference of infrared and visible electromagnetic waves, but let's not worry too much about that!