Ah, makes me think of MacOS system 7 days. MacOS formatted the 3.5" disks with its own filesystem, so if you copied a file onto it, and put the disk in a Windows PC (or DOS?), the PC would go "Huh?".
3 decades later, hooray, now we can share files between Android and iPhone!
3 decades later, hooray, now we can share files between Android and iPhone!