Cylinder 0 Track 0 Record number
Description
Number of Bytes All Cylinders Except 0 Track 0 Record
Description
Number of Bytes
Track 11
Record
Description
Number of Bytes RO R1 R2
D D Check-
point
8 24 4096 RO R1 R2
DDD
8 4096 4096 • • • RO R23 R24
DDD
8 4096 4096 Figure 3-16. 3340 Record Layout
R3 I Key I Label I I I 4 80 78 IBM VM/370 Service Routines Program Logic
R4 R5 R6 I I Allocation Key IFormat Key I Format
Byte I 4 I 5
Map I Label I Labef I _1 1024 44 96 44 96

Cylinder 0 Track 0 Record number R0 R1 Description L-.J Number of Bytes
A!! Cylinders Except 0 Track 0 Record R0 R1
R2 Check­ Point
R3
Key I Label I 1 4 80 R2
R4 R5 R6 Allocation Key IFormat Key I Format
Byte I I 5
Map I Label I I 1024 44 96 44 96
R3 R4
Description DDoDoDL:JU Number of Bytes
Track 29
Record
Description
Number of Bytes 4096 • • • 4096 4096 R0 R117 R118 R119 I II II II II:lI II=l UULJUOUO 4096 4096 4096 Figure 3-17. 3350 Record Layout 4096 R120 I I I I LJ 4096 Chapter 3. The Format Service program 79