The rabbit hole goes a long way down. In HFS+...
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Originally Posted by Wikipedia
The Catalog File, which stores all the file and directory records in a single data structure...contrasts with other file systems that store file and directory records in separate structures (such as DOS's FAT file system or the Unix File System), where having structure distributed across the disk...
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https://en.wikipedia.org/wiki/Hierarchical_File_System
It appears that Inode Indirect Blocks correspond to the Extent Overflow File. However Mac OSX does use
something called inodes.
OP -- here's another option if your not talking about gigabytes of data: Email the files to yourself.