44 bytes key -track 0 cylinder 0 96 bytes data area
Format 5 DSCB type label used to be compatible with other systeas. 05 05 05 05 00 FORMAT 5 LABEL L 44 Byte Key 96 Byte Data Area
Figure 3-9. Record 6 For.at 4096 bytes -1 page, track 0 or track 1 (2314/2319 devices only).
F3 Record is reserved for IBM use, and is referred to as a
filler record.
Figure 3-10. Record F3
1624 bytes track 1 (2314/2319 devices only) Record F4 is used only on 2314 and 2319 to align Record 4 on the
track.
Figure 3-11. Record F4 824 bytes -cylinder 0, track 1 (2314/2319 devices only).
The first segment of Record 4 is used for paging.
Figure 3-12. Record 4 74 IBM VMj370 Service Routines Program Logic
Cylinder 0 Track 0 Record
Description
Number of Bytes
Record
Description
Number of Bytes
All Cylinders except 0 lrE£!s.Q. Record
Description
Number of Bytes
Record
Description
Number of Bytes
Record
Description
Number of Bytes
Record
Description
Number of Bytes
Record
Description
Number of Bytes
RO R1 R2 R3 Check Key I Label
point I I I I I I I II I I I 8 24 4096 4 80
RO RF3 RF4 R4 nnnn I I I I I II I 8 4096 1624 824
RO R1 R2
nnn I I I I I I 8 4096 2472
RO R2 R3 R4
DODD
8 1624 4096 824
RO R4 R5
nnn I I I I I I 8 3272 3296
RO R5 R6 R7
DODD
8 800 4096 1648
RO R7 R8 I I I I I UUU 8 2448 4096
Figure 3-13. 2314/2319 Record Layout
R4
Allocation
Byte
Map I 1024
R5 R6 I Format i
Foem
"
n
Keyl 4
Key I 5 ••••••• I Label I Label
! II ,,! I I I I 44 96 44 96 "7','dck:, C 4 ar€: tracks 4 to 9,10 to 14, and 15 to 19.
The last record is R32.
Chapter 3. The For.at Service Prograa 75
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