Owners must, of course, transfer some music or other digital material onto their preferred storage medium before setting off.

What if rather than squeezing as much energy storage inside the car as you can, the car itself was the storage medium?

Digital sound files can be stored on any computer storage medium.

Photographic film or the magnetic storage medium inside floppy disks can be used as inexpensive visible-light filters.

Applications can view this as a network attached storage medium.