Comment by netsharc
21 hours ago
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!
What does this have to do with System 7?
Operating systems have always used their own filesystems, and it persists to this day.
The only obvious exceptions that come to mind are iso9660 as a standard for CDs, and people generally go out of their way to use FAT/FAT32/whatever on USB keys and SD cards for compatibility with cameras or whatever device they're plugging the card into. But the latter is a choice users actively make to ensure the FS is compatible with the device, rather than a default.
System 7 had built in tools to read and write DOS disks: https://en.wikipedia.org/wiki/Apple_File_Exchange
I distinctly remember how it was the bare minimum. You'd mount a disk or open a plain text file, and there'd be a lot of strange characters that weren't decoded properly.
And that's why we all had to buy a copy of MacLinkPlus!