Darya.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

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..."

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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.

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.

When the Backup utility (BACKUP) creates sequential disk save sets, it stores the save-set file in the MFD.

=System files=
A master file directory of a non-system disk stores the following system files:
* 000000.DIR is the master file directory directory file
* BACKUP.SYS is a backup log file reserved for future use
* [[BADBLK.SYS]] contains all the bad blocks on the volume
* [[BADLOG.SYS]] contains a list of suspected bad blocks on the volume that are not listed in the [[BADBLK.SYS|bad block file]]
* [[BITMAP.SYS]] stores the volume bitmap
* [[CONTIN.SYS]] is used as the extension file identifier in a volume set
* CORIMG.SYS is the core image file not used by the OS
* [[INDEXF.SYS]] contains the [[File header|file headers]] for all files on the volume
* [[SECURITY.SYS]]
* [[VOLSET.SYS]] contains a list of the labels of all volumes in the set and the name of the volume set
* [[QUOTA.SYS]] is used by the file system to keep track of the disk usage of each UIC on a volume

In addition to the files listed above, the master file directory of a [[System disk|system disk]] stores the following directories:
* [[SYS0]] contains system-specific files
* [[VMS$COMMON]] contains clusterwide files

[[Category:System Files]]

Master file directory - Revision history

Darya.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..."