When I was surfing the net searching for object-oriented operating systems, I ran into NeXTSTEP, an operating system made by NeXT (Created by Steve Jobs after he was fired from his own company, Apple!) back in 1989, written in Objective-C. When I read about it I also seen that it worked on NeXT computers. Early NeXT computers shipped with a Magneto-Optical drive instead of a hard disk, the former was invented by them.
These pictures is a Magneto-Optical disk. This technology is still used today: look here.
