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Message: [QUOTE="Ancient_Hacker, post: 2491444"] Malcolm wrote: Well I agree that 99.9% of computers out there have OS's with the concept of "directories". By which you probably mean the ability to create multiple, named directories. And without the intervention of the system operator. But there have been plenty of OS's without that concept. Even OS's for $12M computers. Most OS's before 1970 or so had either just one directory for the whole system, or one system directory and one directory per user, or one directory per physical volume, or directories had to be created by system staff. The concept of tree-structured directories didnt get popular until Unix V6 and MSDOS 2.0 came out. [/QUOTE]