ansitape.5 (2012 03)

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ANSITAPE(5) ANSITAPE(5)

NAME

ansitape - ANSI standard magtape labels

DESCRIPTION

An ANSI-labelled tape starts with a volume header. This header speciﬁes the volume name and protec-

tion, the owner of the volume, and the ANSI label standard level that the tape conforms to.

Every ﬁle on the tape has a header, some data blocks, and a trailer. A tape mark follows each of these

elements. At the end of the tape, two tape marks follow the trailer, to indicate logical end-of-tape.

If a ﬁle is too large to be copied onto one tape, it may be continued on another tape by modifying the

trailer section.

VOLUME HEADER

Field Width Example Use

Indicates this is a

volume header.

VOL1 4 VOL1

The name of the

volume.

Label 6 VAX1

Volume protection.

Space means unpro-

tected.

Access 1 space

IGN1 20 << ignored >>

IGN2 6 << ignored >>

The name of the user.Owner 14 Joe User

IGN3 28 << ignored >>

Level 1 3 ANSI standard level.

Owner The owner ﬁeld is 14 characters in ANSI labels. IBM labels cut the owner ﬁeld to 10 charac-

ters. The IGN2 ﬁeld is 10 characters on IBM-format tapes.

HP-UX 11i Version 3: March 2012 − 1 − Hewlett-Packard Company 1

Summary of content (4 pages)

PAGE 1
ANSITAPE(5) ANSITAPE(5) NAME ansitape - ANSI standard magtape labels DESCRIPTION An ANSI-labelled tape starts with a volume header. This header specifies the volume name and protection, the owner of the volume, and the ANSI label standard level that the tape conforms to. Every file on the tape has a header, some data blocks, and a trailer. A tape mark follows each of these elements. At the end of the tape, two tape marks follow the trailer, to indicate logical end-of-tape.
PAGE 2
ANSITAPE(5) ANSITAPE(5) FILE HEADERS Field HDR1 Width 4 Example HDR1 17 FILE.DAT Leftmost 17 characters of filename. Set 6 VAX1 Name of volume set this file is part of. Vol Num 4 0001 Number of this volume within volume set. File Num 4 0001 Number of file on this tape. Generation 4 0001 Like a major release number. Gen Version 2 00 Created 6 b86001 The date of file creation. Expires 6 b86365 Date file expires. Access 1 space File protection. Space means unprotected.
PAGE 3
ANSITAPE(5) ANSITAPE(5) Field HDR2 Rec Format Width 4 Example HDR2 Rec Format Blk Length Rec Length Density Vol Switch 1 5 5 1 1 D 02048 00080 3 0 Record format. Tape block size. Record size. Recording density code. 1 if this is a continuation of a file from a previous reel. Job Recording Car Control Blocking IGN Offset 17 2 1 1 11 2 user/program space space B See following notes. Unused in 9-track tapes. See following notes. See following notes.
PAGE 4
ANSITAPE(5) ANSITAPE(5) The HDR3 and HDR4 labels are not written on IBM tapes. ANSI allows, but does not require, these labels. Field HDR3 OS OS Example HDR3 Use Third file header. Operating-system dependent. This field is reserved for the use of the operating system that created the file. Other operating systems are supposed to disregard HDR3 records. On VAX/VMS, this record contains the RMS file description.