User's Manual

IBM OS/360 AND DOS/360 STANDARD LABELED TAPES
2-8 XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL
The HDR2 label is always created by OS/360 and immediately
follows HDR1 on OS/360 standard labeled tapes. It is not created by
DOS/360. The HDR2 label provides data relating to the physical
parameters of the recorded file such as record format, record length,
and block length.
The EOV2 label is always created by OS/360 and immediately
follows EOV1 on OS/360 standard labeled tapes. It is not created by
DOS/360.
The EOF2 label is always created by OS/360 and immediately
follows EO1 on OS/360 standard labeled tapes. It is not created by
DOS/360.
File position 17 7 This is a code that indicates a volume switch.
0 indicates no volume switch has occurred;
1 indicates a volume switch has occurred.
Job/job step identification 18-34 8 This is an indication of the job/job step that created
the file.
Tape recording technique 35-36 9 This is either a code for 7-track tapes or blanks for 9-
track tapes.
Printer control character 37 10 This is a code indicating whether a control character
set was used to create the file, and the type of control
characters used:
A = ANSI control characters.
M = machine control characters.
blank = no control characters.
Reserved 38 11 Blank.
Block attribute* 39 12 This is a code indicating the block attribute used to
create the file. The codes are:
B = blocked records.
S = spanned records.
R = blocked and spanned records.
blank = not blocked and not spanned records.
Reserved 40-80 13 Blanks.
Table 2- 5. HDR2, EOV2, and EOF2 labels (IBM tapes)
(continued)
Name
Character
position(s)
Field Description
* Fields 3, 4, 5, and 12 are used by the operating system.