5. NULL VOLUME FILE FORMAT DEFINITION
TABLE 6.1 NULL VOLUME DESCRIPTOR RECORD
FIELD BYTES FORMAT DESCRIPTION CONTENT
1 1-4 B4 Record sequence number (1)
2 5 Bl 1-st record subtype code (192)
3 6 Bl Record type code (192)
4 7 Bl 2-nd subtype code (63)
5 8 Bl 3-rd subtype code (18)
6 9-12 B4 Length of this record (360)
7 13-14 A2 ASCII/EBCDIC flag A$
8 15-16 A2 blanks $$
9 17-28 A12 format control document CCB-CCT-0002
10 29-30 A2 Superstructure format control document $E
11 31-32 A2 Superstructure record format revision $A
12 33-44 A12 Logical volume generating facility software release <......>
and revision level
13 45-60 A16 ID of physical volume containing this volume descriptor <......>
14 61-76 A16 Logical volume identifier <......>
15 77-92 A16 Volume set identifier <......>
16 93-94 I2 Total number of physical volumes in the logical vo1ume $1
17 95-96 I2 Physical volume sequence number of the first tape within $1
the logical volume
18 97-98 I2 Physical volume sequence number of the last tape within the $1
logical vo1ume
19 99-100 I2 Physical volume sequence number of the current tape within $1
the logical vo1ume
20 101-101 I4 First referenced file number in this physical volume $$$1
whithin the logical volume.
21 105-108 I4 Logical volume within a volume set $$$2
22 109-112 I4 Logical volume number within physical volume $$$2
23 113-120 A8 Logical volume creation date (YYYYMMDD) <......>
24 121-128 A8 Logical volume creation time (hhmmssdd, dd=deci-seconds) <......>
25 129-140 A12 Logical volume generation country <......>
26 141-148 A8 Logical volume generating agency $$$$$$$$
27 149-160 A12 Logical volume generating facility <......>
28 161-164 I4 Number of file pointer records in volume directory $$$0
29 165-168 I4 Number of records in volume directory $$$1
30 169-260 A92 Volume descriptor spare segment (always blank filled) <$....$>
31 261-360 AlOO Local use segment <$....$>