http://famicomworld.com/workshop/tech/nintendos-development-disks/
<< The disks were used by many third-party game developers. >>
Does it mean 1st party games did not? I am a bit confused. Give me a hand :)
Totally , as example : The Legend Of Zelda used a White disk , also in this photo you can see Miyamoto and a Dev disk near to the disk system (http://img4.meristation.com/files/imagenes/general/original_39.jpg) (Near the Fami controller)
Thanks there! For a moment I thought they had their own special dev disks. I wandered on the brink of total madness until you posted.
(Nice cream socks huh! ;D)