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== Directories == The structural support of an ODS volume is provided by a ''directory file''—a special file containing a list of file names, file version numbers and their associated FIDs, similar to VSAM catalogs on [[MVS]] and directories on [[Unix]] file systems and [[NTFS]]. At the root of the directory structure is the ''master file directory'' (MFD), the root directory which contains (directly or indirectly) every file on the volume. <div style="width: 530px; margin-left: auto; margin-right: auto; clear: both"> [[Image:Files 11 directory structure.png]]<br/> <small>''This diagram shows an example directory containing 3 files, and the way each filename is mapped to the <kbd>INDEXF.SYS</kbd> entry (each INDEXF entry contains more information; only the first few items are shown here).''</small> </div>
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