Do we know how far the Disk System was away from release outside of Japan? I've always wondered what it would have looked like and how it would have been marketed here, based on how other things were adapted.

Wasn't the American NES able to potentially use both a cartridge and a disk at the same time since the drive would have been underneath the system? I know cartridge pins that connected to the expansion port directly were removed after plans were dropped, but could there have ever been a "super game" that needed both a disk and a cartridge to run something?