Owner identifier

The volume header label VOL1 contains an “owner identifier” which is used for checking the access authorization.

The owner identifier is normally empty or simply specifies the computer center as the owner of the tape. In this case, any user may access the tape.

If the owner identifier shows that the tape belongs to a specific user, the “access indicator” is taken from the HDR1 label when the first file on the tape is created if this file is created by the owner of the tape. If a restriction is noted in the access indicator, only the tape owner may access the tape. If the tape owner and the owner identifier are the same, or if the owner identifier is empty, the access indicator is assumed to denote unrestricted access.