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File No. S360/S370-30
Order No. GC28-6680-5
OS




Systems Reference Library




OS Tape Labels

Release 21


This publication describes how the IBM System/360 Operating
System processes magnetic tape volumes with IBM standard labels,
American National Standard labels, nonstandard labels, or no labels.
Included for the guidance of programmers and operations analysts
are discussions of:

Label formats and contents
Tape volume layouts
Label processing for input, output, multiple data set, and
multiple volume conditions
Tape characteristics
Nonstandard label processing routines and volume label editor
routines
Component considerations
Using tape volumes created by other systems
External labels
Sixth Edition (April 1973)
This edition replaces the previous edition (numbered GC28-6680-4) and makes that edition obsolete.
This edition applies to Release 21.7 of OS and to all subsequent releases unless otherwise indicated in
new editions or technical newsletters.
Significant system changes are summarized under "Summary of Amendments for Release 21.7" and
"Summary of Amendments for Release 21" following the list of figures. Each technical change is
marked by a vertical line to the left of the change.
Information in this publication is subject to significant change. Any such changes will be published in
new editions or technical newsletters. Before using the publication, consult the latest IBM System/360
and System/370 Bibliography, GA22-6822, to learn which editions and technical newsletters are
applicable and current.
Requests for copies of IBM publications should be made to the IBM branch office that serves you.
Forms for readers' comments are provided at the back of the publication. If the forms have been
removed, comments may be addressed to IBM Corporation, Programming Center-Publishing,
Department D58, Monterey and Cottle Roads, San Jose, California 95193. All comments and
suggestions become the property of IBM.