https://wiki.vmssoftware.com/index.php?title=Master_file_directory&feed=atom&action=historyMaster file directory - Revision history2024-03-29T08:00:09ZRevision history for this page on the wikiMediaWiki 1.31.0https://wiki.vmssoftware.com/index.php?title=Master_file_directory&diff=150&oldid=prevDarya.zelenina: Created page with "The '''master file directory''' is the top directory on a volume. It is displayed as [000000] in file specifications. It can also be omitted when you..."2018-12-20T08:48:04Z<p>Created page with "The '''master file directory''' is the top <a href="/Directory" title="Directory">directory</a> on a <a href="/Volume" title="Volume">volume</a>. It is displayed as [000000] in file specifications. It can also be omitted when you..."</p>
<p><b>New page</b></p><div>The '''master file directory''' is the top [[Directory|directory]] on a [[Volume|volume]]. It is displayed as [000000] in file specifications. It can also be omitted when you refer to a subdirectory specification: both DKA0:[000000.USERS] and DKA0:[USERS] are valid specifications and point to the same directory. The directory file for the master file directory is stored in the master file directory itself.<br />
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Usually, the master file directory is used to list the reserved files and users' file directories; users seldom enter files into the MFD, even on private volumes. In fact, on a private volume, it is most convenient for users to create a directory that has the same name as their default directory on a system disk.<br />
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When the Backup utility (BACKUP) creates sequential disk save sets, it stores the save-set file in the MFD.<br />
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=System files=<br />
A master file directory of a non-system disk stores the following system files:<br />
* 000000.DIR is the master file directory directory file <br />
* BACKUP.SYS is a backup log file reserved for future use<br />
* [[BADBLK.SYS]] contains all the bad blocks on the volume<br />
* [[BADLOG.SYS]] contains a list of suspected bad blocks on the volume that are not listed in the [[BADBLK.SYS|bad block file]]<br />
* [[BITMAP.SYS]] stores the volume bitmap<br />
* [[CONTIN.SYS]] is used as the extension file identifier in a volume set<br />
* CORIMG.SYS is the core image file not used by the OS<br />
* [[INDEXF.SYS]] contains the [[File header|file headers]] for all files on the volume<br />
* [[SECURITY.SYS]]<br />
* [[VOLSET.SYS]] contains a list of the labels of all volumes in the set and the name of the volume set<br />
* [[QUOTA.SYS]] is used by the file system to keep track of the disk usage of each UIC on a volume<br />
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In addition to the files listed above, the master file directory of a [[System disk|system disk]] stores the following directories:<br />
* [[SYS0]] contains system-specific files<br />
* [[VMS$COMMON]] contains clusterwide files<br />
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[[Category:System Files]]</div>Darya.zelenina