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Message: [QUOTE="Jalapeno, post: 2491608"] While true, you can, however, create HFS data sets that are organized with a tree-like structure using directories via USS (Unix Systems Services). From a C program, luckily, your file structure (whether it is PDS, Physical Sequential, or VSAM or whatever) looks like a stream and the details aren't necessary. If you are writing a program that _needs_ to know these details then, it's off-topic here :o) (I am pretty sure you know all this Barry. Sometimes MVS people forget about USS in MVS.) [/QUOTE]