ODS - On-Disk Structure

The VMS “filesystem”

Defines:

On-disk data structures

Disk File structures
(Directories are files, too!)


File Security
Protection Mask, Access Control List (ACL)

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ODS defines how files are structured on disk. This equates to the UN*X concept of a “filesystem” - a system of files and directories on disk.

File protections are provided for, including UIC-based protection masks and Rights Identifier based Access Control Lists.

ODS provides a file “version” (“generation”) number which makes unique files which otherwise have the same name and file-type extension.