Data Areas
This section contains a description of a: • Track header record • Cylinder header record • lOB CYLINDER HEADER RECORD o 10 18 lC 124 <
< VHRMREC VHRMTCK Hex --0 0 VHR DC 4 4 VHRCYLNO DS
A 10 DS 10 16 VHRCLOCK DS
18 24 VHRMREC DS lA 26 VERCYLA DS lC 28 VHRMTCK DS VHR VHRCYLNO I IA VHRCLOCK 11A I 11E I CL4'VHR' CL6'0' XL6 ' , D'O' X'O' H'O' H'O' VHReYLA VBRVSER > 12g§£!:!£!!.QIl EECCHH of input DASD unit
Not used
Time of day clock value CC address of last cylinder on this type lE 30 VHRVSER DS CL6'VOLSER' Volume serial number of input DASD unit
24 36 DS CL44' , Figure 5-3. Cylinder Header Record 106 IBM VMj370 Service Routines Program Logic
of DASI).

TRACK HEADER RECORD 0 4 8 10 20 <28 to FFF
< Hex --(5 4 6
8
A E 10 20 28
Dec --(5 4
6
8 10 11
16
32 40 THR 16 THRNDRD I THRNDRT IA IE THRNDRL I THRFLAG I THRHADD THROOO THR001 (Count Field or Data) > rielg_!!H 12!!§£riptiol! THR DC CL4'THR , ID of track header record
THRNDRD DC H'O' The number of count fields in the THR
THRNDRT DC H'O' The nuaber of 4K data records on taFe
THRDRL DC H'O' Length of the short (last) data record
THRFLAG DC XL1'0' Flag for THRFLAG SPECIAL EQU XI01'-----overflov THRHADD DC THROOO DC THR001 DC XL5'0' XL16'0' XL8'O' The home address reordered
Record 0 from the D1SD unit
Count field of the first record
Count fields and data
Figure 5-4. Track Header Record
Chapter 5. The DASD Dump Restore Program 107