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- Volume_table_of_contents abstract "In the IBM mainframe storage architecture, Volume Table Of Contents, or VTOC, is a data structure that provides a way of locating the data sets that reside on a particular disk volume. It is the functional equivalent of the root directory of a mass storage device (floppy, jump drive, hard disk, etc.) on a PC or minicomputer, e.g. / on Unix or Linux, C:\\ on MS-DOS or Microsoft Windows, can reside within the first 64K tracks on the volume, and lists the names of each data set on the volume as well as size, location, and permissions. Additionally, it contains an entry for every area of contiguous free space on the volume. The third record on the first track of the first cylinder of any volume of DASD (i.e. disk pack) is known as the volume label and must contain a pointer to the location of the VTOC. A VTOC is added to a disk when it is initialized using the Device Support Facilities utility program, ICKDSF. VTOC was originally designed for removable disk packs.To locate a data set, a program will generally interrogate a z/OS catalog to find the volume where the data set resides. Having found the correct volume, the VTOC is searched to find out where on the disk the data set is stored.The VTOC comprises records known as Data Set Control Blocks, or DSCBs. There are ten types of DSCB.The first DSCB in the VTOC is always a format 4 DSCB which describes the VTOC itself and attributes of the disk volume on which this VTOC resides. The second DSCB is always a format 5 DSCB which describes free space within the VTOC. Normally, the rest of the VTOC will contain format 0 DSCBs, which are empty entries, and format 1 or format 3 DSCBs, which describe the \"extents\" of data sets, giving their start address and end address of up to 16 such \"extents\" on disk. The initial part of a data set is described by a format 1 DSCB. If necessary, format 3 DSCBs are used to describe further \"extents\" of the data set. When a data set is deleted, its format 1 DSCB is overwritten to become a format 0 DSCB, and the format 3 DSCB, if one exists, is similarly deleted.Originally, a VTOC search was a sequential scan of the DSCBs, stopping when the correct format 1 DSCB was found or the end of the VTOC was reached. As disk volumes became larger, VTOC search became a bottleneck and so a VTOC index was added.".
- Volume_table_of_contents wikiPageExternalLink DGT2S341.
- Volume_table_of_contents wikiPageExternalLink dgt2d450.
- Volume_table_of_contents wikiPageID "2899605".
- Volume_table_of_contents wikiPageLength "4978".
- Volume_table_of_contents wikiPageOutDegree "21".
- Volume_table_of_contents wikiPageRevisionID "672396710".
- Volume_table_of_contents wikiPageWikiLink Category:File_system_management.
- Volume_table_of_contents wikiPageWikiLink Category:IBM_mainframe_operating_systems.
- Volume_table_of_contents wikiPageWikiLink Category:IBM_storage_devices.
- Volume_table_of_contents wikiPageWikiLink Count_key_data.
- Volume_table_of_contents wikiPageWikiLink Cylinder-head-sector.
- Volume_table_of_contents wikiPageWikiLink Data_Control_Block.
- Volume_table_of_contents wikiPageWikiLink Data_set_(IBM_mainframe).
- Volume_table_of_contents wikiPageWikiLink Direct-access_storage_device.
- Volume_table_of_contents wikiPageWikiLink File_size.
- Volume_table_of_contents wikiPageWikiLink File_system_permissions.
- Volume_table_of_contents wikiPageWikiLink IBM_mainframe.
- Volume_table_of_contents wikiPageWikiLink IBM_mainframe_utility_programs.
- Volume_table_of_contents wikiPageWikiLink Linux.
- Volume_table_of_contents wikiPageWikiLink MS-DOS.
- Volume_table_of_contents wikiPageWikiLink Microsoft_Windows.
- Volume_table_of_contents wikiPageWikiLink 360_and_successors.
- Volume_table_of_contents wikiPageWikiLink Root_directory.
- Volume_table_of_contents wikiPageWikiLink Unix.
- Volume_table_of_contents wikiPageWikiLink Volume_(computing).
- Volume_table_of_contents wikiPageWikiLink OS.
- Volume_table_of_contents wikiPageWikiLinkText "Format 4 DSCB".
- Volume_table_of_contents wikiPageWikiLinkText "Volume table of contents".
- Volume_table_of_contents subject Category:File_system_management.
- Volume_table_of_contents subject Category:IBM_mainframe_operating_systems.
- Volume_table_of_contents subject Category:IBM_storage_devices.
- Volume_table_of_contents hypernym Structure.
- Volume_table_of_contents type Building.
- Volume_table_of_contents type Computer.
- Volume_table_of_contents type Redirect.
- Volume_table_of_contents comment "In the IBM mainframe storage architecture, Volume Table Of Contents, or VTOC, is a data structure that provides a way of locating the data sets that reside on a particular disk volume. It is the functional equivalent of the root directory of a mass storage device (floppy, jump drive, hard disk, etc.) on a PC or minicomputer, e.g.".
- Volume_table_of_contents label "Volume table of contents".
- Volume_table_of_contents sameAs Q1689060.
- Volume_table_of_contents sameAs Volume_Table_Of_Contents.
- Volume_table_of_contents sameAs 볼륨_목록.
- Volume_table_of_contents sameAs m.08b4kg.
- Volume_table_of_contents sameAs Q1689060.
- Volume_table_of_contents wasDerivedFrom Volume_table_of_contents?oldid=672396710.
- Volume_table_of_contents isPrimaryTopicOf Volume_table_of_contents.