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PDS/E structure is similar to PDS and is used to store the same types of data. However, PDS/E files have a better directory structure which does not require pre-allocation of directory blocks when the PDS/E is defined (and therefore does not run out of directory blocks if not enough were specified). Also, PDS/E automatically stores members in such a way that compression operation is not needed to reclaim "dead" space. PDS/E files can only reside on disk in order to use the directory structure to access individual members.
== See also ==
[[category:Computer data]]▼
* [[Volume table of contents]] (VTOC), a structure describing data sets stored on the disk
[[Category:Data management]]
[[Category:IBM Mainframe computer operating systems]]
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