VTOC - Revision history

Polluks at 14:12, 3 April 2025

2025-04-03T14:12:23Z

SJK at 11:31, 2 January 2021

2021-01-02T11:31:30Z

SJK: Created page with "{{FormatInfo |formattype=electronic |subcat=Filesystem |released=1965 |wikidata={{wikidata|Q1689060}} }} '''VTOC''' (Volume Table of Contents) is the native filesystem of the ..."

2021-01-02T11:30:17Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Filesystem |released=1965 |wikidata={{wikidata|Q1689060}} }} '''VTOC''' (Volume Table of Contents) is the native filesystem of the ..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Filesystem
|released=1965
|wikidata={{wikidata|Q1689060}}
}}
'''VTOC''' (Volume Table of Contents) is the native filesystem of the IBM mainframe operating systems z/OS (previously called OS/390 and before that MVS) and z/VSE (formerly known as DOS/VSE). It originates with the OS/360 mainframe operating system released in 1965 but has evolved over the decades since.

Note that on z/OS and z/VSE, the term "dataset" is used instead of "file", but the meaning is fundamentally the same. On z/OS, the VTOC filesystem stores "datasets" whereas "files" (or to use their full name, "Unix files") are stored inside the Unix-compatible HFS and zFS filesystems. HFS and zFS filesystems themselves are stored as datasets inside the VTOC filesystem.

Note that other IBM mainframe operating systems, such as z/VM (formerly known as VM/CMS) use different filesystems instead.

The mainframe VTOC filesystem is supported by z/Linux as a partition table format, in which a Linux filesystem partition is stored in a single contiguous dataset.

Note that the term "VTOC" is also used on some other platforms (e.g. Solaris SPARC) to mean the partition table format, but that is a very different on-disk structure despite the similar name.

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	* [[Wikipedia:Volume Table of Contents\|Wikipedia article]]		* [[Wikipedia:Volume Table of Contents\|Wikipedia article]]

−	[[Category:IBM]]	+	[[Category:IBM mainframe]]

← Older revision		Revision as of 11:31, 2 January 2021
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	Note that the term "VTOC" is also used on some other platforms (e.g. Solaris SPARC) to mean the partition table format, but that is a very different on-disk structure despite the similar name.		Note that the term "VTOC" is also used on some other platforms (e.g. Solaris SPARC) to mean the partition table format, but that is a very different on-disk structure despite the similar name.
		+
		+	== Links ==
		+	* [[Wikipedia:Volume Table of Contents\|Wikipedia article]]
		+
		+	[[Category:IBM]]