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Aug 2, 2024 at 21:18 comment added gidds @DrSheldon But DiskWarrior wasn't talking about directories in that sense.  It was clearly using the term ‘directory’ (singular) to refer to all metadata on the drive, for all files (regardless of what directories/folders they were in).
Aug 1, 2024 at 2:38 comment added DrSheldon @gidds: For an HFS+ volume, directories and folders mean the same thing, just as they did in HFS. So DiskWarrior is using correct terminology. It's only on long-obsolete MFS volumes that there is a difference.
Jul 30, 2024 at 21:50 comment added gidds IIRC, the documentation for DiskWarrior also referred to ‘the directory’ (singular) for a volume — and that was for HFS+.  Was it using outdated terminology, or could that apply to filesystems much more recent than MFS too?
Jul 30, 2024 at 11:08 comment added Hans-Martin Mosner @supercat indeed, MFS did not allow files with the same name to exist in different folders, because technically, they were all in the same (single) directory on the disk. When accessing files from programs, you also would not use the containing folder, so a file "Expenses" in folder "Financial" on disk "Business" would be called "Business:Expenses", while on an HFS volume it would be "Business:Financial:Expenses".
Jul 29, 2024 at 21:12 comment added supercat @JeremyP: Did MFS allow files in different folters to have the same name? If not, the fact that all files are in the same directory would be semantically relevant.
Feb 3, 2023 at 9:18 comment added JeremyP You could argue that the fdFldr number was really just MFS's way to implement directories. i.e. it is an implementation detail.
Jan 22, 2023 at 12:55 history bounty awarded user3840170
Jan 18, 2023 at 1:22 comment added Raffzahn Huh :)) Like that being dug out. Upvote for historical detail. Just two points A) while being a single directory (catalogue) file system the folder numbers are what creates a levels - something otherwise called directories. Directories do not have to be recursive structures to work. A similar way was used on some mainframe file systems that had their catalogue in single key ISAM structures. B) Maybe more relevant, your explanation makes it look as if they are a first by Apple, but Folders existed already before the Mac - Jobs saw them at PARC.
Jan 18, 2023 at 1:10 history answered DrSheldon CC BY-SA 4.0