Addressing Structure Of An Hp 7925H Disc Drive - HP 7925D Service Manual

Appendix A
HP-IB
CONTROLLER
IN
CHARGE
(CIC)
CONTENTS
ON.E HP-IB CIC
UP TO 4
DISC DRIVES
PER CIC
HP INTERFACE BUS (HP-IB)
CONTROLLER
CONTROLLER CONTROLLER
CONTROLLER
- - - -
- - - - - - - - -
DISC
DISC DISC DISC
DRIVE
DRIVE DRIVE
DRIVE
HP 7925H
HP 7925H HP 7925H HP 7925H
NO.1
NO.2 NO.3
NO.4
/'
"
7925
8
HEAD~
823 CYLINDERS
PER DRIVE
9 DATA HEADS
1 SERVO HEAD
PER DRIVE
CARRIAGE
ASSEMBLY
o
SERVO
4
6
UPPER AND LOWER
PROTECTIVE DISCS
64 SECTORS
PER TRACK
NOTE: A TRACK IS SELECTED WHEN
A CYLINDER AND A HEAD
ARE SPECIFIED
7311-91
A-2
Figure A-I. Addressing Structure of an HP 7925H Disc Drive