Nintendo’s Development Disks
Article
When game developers were creating their Famicom Disk System games, they saved them on white Nintendo prototype development disks.
The disks had all the characteristics of the standard yellow disks, but they, of course, were white and had unique labels that allowed each prototype to be identified by title and volume number, if needed.
The disks were used by many third-party game developers.
Side A of a Nintendo proto development disk.
Side B of a Nintendo proto development disk.
A Nintendo proto development disk in its case.