DESCRIPTION Reserved for future use as required by

the American National Standards Insti-stute,

Inc. Should

contain spaces.

al LABEL STANDARD LEVEL

American National Standards Institute, Inc. Should contain spaceJ.

Indicates a spec1flc customer,installotion and

lor

system to which the volume be-longs.This field may be"a standardized code,name,addreJs etc.

Reserved for future use as required by the American National Standards hlSti-tute, Inc. Should contain spaces.

Indicates whether this volume observes the American National Standards:

Dec. 1: Volume observes the standards (1 is also the default value) Space: Volume does not observe the standards, but it follows an agreed femat.

,-STANDARD MAGNETIC TAPE FILE LABEL IBM Standard Tope File Label Format and Contents

rFleld

l>1l12

File Securit

10

12

13 14

~

File Identifier File Serial

Number ~~~~tion 15~~ation ^Block _Count System Code Reserved

... Mi"<tll() NIN ~I~ MI~

:;ql;g

.~I~ l:..t ;"rl~ i.c)ll/'lui

531:0

^{~I;t o}

'"

L:~~:I ~~~t~f{er

Volume Sequence Nr---1

File Sequence Number----..J

I L~~~~~~t~~m~~~b~rGeneratjon

FIELD NAME AND LENGTH LABEL IDENTIF IER 3 bytes EBCDIC

FILE LABEL NUMBER 1 byte EBCDIC FILE IDENTIFIER 17 bytes EBCDIC FILE SERIAL NUMBER 6 bytes EBCDIC

DESCRIPTION Identifies the type of label:

HDR: Heoder--beginning of doto file.

EOF: End of File--end of a set of data.

EOV: End of Volume--end of the phy-sical reel.

Always a 1

Uniquely identifies the entire file, may contain only printable characters.

Uniquely identifies a file-volume relation-ship, This field is identical to the Volume Serial Number in the volume label on the first Of only volume of a multi-volume file or a mult.i-file set. This field will normally be numeric(OOOOOl to 999999) but may contain any six alphameric characters.

FIELD NAME AND LENGTH DESCRIPTION

VOLUME SEQUENCE Indicates the order of a volume in a given NUMBER file ar multi-file set. This number must be 4 bytes numeric(OOOO-9999).Multiple volumes of an output file will be numbered in conse-cutive sequence.

FILE SEQUENCE Assign numeric sequence to a file within

NUMBER a multi file set.

4 bytes

GENERATION NUMBER Numerically identifies the various editions

4 bytes of the file.

VERSION NUMBER OF Indicates the version of the generation of

GENERATION a file.

2 bytes

-~

STANDARD MAGNETIC TAPE FILE LABEL ( •••• Cant 'd) FIELD NAME AND LENGTH

CREATION DATE 6 bytes

10 EXPIRATION DATE 6 bytes

11 FILE SECURITY 1 byte

12 BLOCK COUNT 6 bytes

DESCRIPTJON

Indicates the year and the day of the year that the fi Ie was created:

Position Code Meaning

1 blank none

2-3 00-99 year

4-6 001-366 day of year

(e.go,January 31,1965 would be entered as 65031)

Indicates the year and the day of the year when the fi Ie may become a scratch tape.

The format of this field is identical to field 9.0n a multi-file reel, processed se-quentially,all files are considered to expire on the same day.

Indicates the security status of the file.

0: No security protection.

1: Security protection. Additional identifi-cation of the file is required before it can be processed.

Indicates the number of data blocks written on the fi Ie from the last header labe I to the first trailer label, exclusive of tape marks.

Count does not include checkpoint records.

This field is used in" trailer labels.

IBM Standard Tape File lobe I Format and Contents FIELD NAME AND LENGTH

13 SYSTEM CODE 13 bytes 14 RESERVED

7 bytes

DESCRIPTION Uniquely identifies the programming system.

Reserved

~- '---

'-STANDARD MAGNETIC TAPE FILE LABEL ANSI Standard Tape File Label Format and Contents

Fiel

,

A I"'\~~"':':'IUIIII bH

.

I 2

3

4 5 6 7 B 9 10 II 12 13 14

File

File Identifier Set Section Creation Expiration Block System Code Reserved for

Identifier Numbe Date Date Count ANSI

'"

^{- N N ~~ - N}

"''''

^{~~ ~I~ N !;;!1l}

'"

^:g

^51-

^{~ ... 0}

I

LFile Label Number Label Identifier

Fi Ie Sequence Number---1

I

L-Version Number of Generation Generation Number

FIELD NAME AND LENGTH DESCRIPTION FIELD NAME AND LENGTH DESCRIPTION

=1 LABEL IDENTIF IER Identifies the type of label: 5 FILE SECTION NUMBER Indicates the order of a volume in a given

b

3 bytes,ASCIl HDR: Header--beginning of a data file. 4 bytes file or multi-file set.(The first file must be

'"

EOF: End of File--end of a set of data. numbered 0001).

_ EaV: End of Volume--end of the

phy-FILE SEQUENCE Assigns numeric sequence to a fi Ie within sical reel.

NUMBER a multi-file set.(The first file must be num-FILE LABEL NUMBER Indicates the sequence of this label within 4 bytes bered 0001).

I byte,ASCIl a label group(HDR,EOF ,EOV).DOS/VS GENERATION NUMBER Numerically identifies this edition of the supports File label 1 only and ignores sub- 4 bytes file. (Must be numerical or blank).

sequent numbers.

FILE IDENTIFIER Identifies the entire file.May be any cha- VERSION NUMBER OF Indicates this version of the generatl on in 17 bytes,ASCIl recter exept a quote(I). GENERATION field 7.(Must be numerical or blank).

2 bytes 4 SET IDENTIFIER Identifies the volume-file relationship.

CREATION DATE Indicates the year and the day of the year 6 bytes,ASCIl Generally,this field is identical to the

volume serial number from the VOL label 6 bytes that this file was created (byyddd),where:

or the first or only volume of the logical b= blank yy= year (00-99)

file. ddd= day (001-366)

-STANDARD MAGNETIC TAPE FILE LABEL

C ••••

Cont'd)

ANSI Standard Tape File Label Format and Contents

FIELD NAME AND LENGTH DESCRIPTION FIELD NAME AND LENGTH DESCRIPTION

TO

EXPIRATION DATE

Indicates the year and the day of the year

6 bytes

that this file may become a scratch tape.

Same format as above (Field 9).

11

ACCESSIBILITY

IndIcates tho accessibility protection of

I byte

the file.

Space: no acceuibility protection.

Nonspace: accessibility protection.

12

BLOCK COUNT

Indicates the number of data blocks

(phy-6 bytes

sical records) written for this logical file.

T3

SYSTEM CODE

Uniquely identifies the programming 13

bytes

system.

~:T4 ^RESERVED

Reserved for future use as required by

7 bytes

ANSI.(American National Standards

Insti-tute,lnc:.). Should be recorded as spaces.

I

\'---~

'''--'-'

'--

'-STANDARD DASD FILE LABEL, FORMAT I

(Format 1: This format is common to all data files on Direct Access Storage Devices) Field

Opt"

I"lle tvoe I I

~

9 10 II 13 14 Reserved

~~

g a

Record format-.J

I

B loc:k length

FIELD NAME AND LENGTH

Dans le document DOS!VSE Handbook (Page 106-111)