I don't think Folders exist, by the way. They are merely 'prefixes' to a File Name's entire name. Folders aren't actual 'partitions'. They're just spellings added to the front of the file-name that the File Manager uses for Display Purposes.
For example, I have a file called XYZ.EXT
It's stored in Folder1 and it's Subfolder2.
The true file name isn't "XYZ.EXT." It's actually "Folder1/Subfolder2/XYZ.EXT". (And the Backslashes are Operating-System dependent - some OS's use Forward Slashes, some Back Slashes.)
But the file name isn't "XYZ.EXT" - the correct spelling is the entire Path Name.
So a Folder doesn't exist as a physical partition - it's simply a convenience for the OS's file-manager to display entire-file-names into chopped-up, shorter, easier-to-read identifiers.
When i've used hex-editors to 'open' a disk and 'find' files, I'll find sectors of files scattered all over - these appear "fragmented" in my mind, but in reality, the OS and the Disk have algorithms that define their own sequencing. MY ideas of sequencing (Block 1 is followed by Block 2 is followed by Block 3) has nothing to do with the reality of OS and Disk Read or Write orders.