Random question: What filesystems shipped in #FreeBSD 15.0 base would support being used as a writable root filesystem?
- UFS
- ZFS
- msdosfs?
- ext2fs?
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Indeed so. Linux had a filesystem type named umsdos that layered a raft of non-native semantics on top of the FAT on-disc data structures with the use of magic '--LINUX.---' files.
I think that we can safely say in the 2020s that, across the world of Windows NT, BSDs, Linux, et al., use of the FAT filesystem format has been relegated to edge cases like some boot volumes (e.g. the EFISP) and some data interchange, and isn't in general use for system volumes.
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