Although Multics didn't store "files" per se, but segments, which has a max size of 1 MiB of 9 bit bytes (36 bit CPUs). The were organized in a hierarchical ma

Although Multics didn't store "files" per se, but segments, which has a max size of 1 MiB of 9 bit bytes (36 bit CPUs). The were organized in a hierarchical manner, with '>' as the separator (vs. '/' for UNIX(TM) and its descendants, and '\' for MS-DOS and Windows since '/' was used in version 1 for argument :-( ), and were accessed in single level store fashion, mapped into your address space. There was some time after its creation (as I remember hearing, at least) a "multi-segment file" abstraction created for data sets that were > 1 MiB, something of a kludge.