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== Partitioned Datasets ==
For example, a '''PDS''' or '''Partitioned Data Set''' is a dataset containing multiple ''members'', each of which holds a separate sub-data set, similar to a [[directory (file systems)|directory]] in other types of [[file system]]. This type of dataset is used to hold executable programs, or '''Load Modules'''. PDS's are also used to store source program libraries, especially Assembler macro definitions. A PDS is most closely analogious to a [[ZIP (file format)|Zip]] file on microcomputers, except the files stored in a PDS are not compressed.
A PDS consists of a directory and a group of small, related sequential files stored together in a single dataset. Each sequential file is known as a member of the PDS and is accessed directly using the directory structure. Once a member is located, the data stored in that member is handled in the same manner as a PS (sequential) file.
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