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is a data set 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]]s. This type of data set is often used to hold ''load modules'' (old format bound executable programs), source program libraries (especially Assembler macro definitions), [[ISPF]] screen definitions, and [[Job Control Language]]. A PDS may be compared to a [[ZIP (file format)|Zip]] file or [[COM Structured Storage]].
A Partitioned Data Set can only be allocated on a single volume and have a maximum size of 65,535 tracks.
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Besides members, a PDS contains also a directory. Each member can be accessed indirectly via the directory structure. Once a member is located, the data stored in that member are handled in the same manner as a PS (sequential) data set.
Whenever a member is deleted, the space it occupied is unusable for storing other data. Likewise, if a member is re-written, it is stored in a new spot at the back of the PDS and leaves wasted “dead” space in the middle. The only way to recover “dead” space is to perform
| title = z/OS DFSMSdfp Utilities Version 2 Release 3
| id = SC23-6864-30
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