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Theory of Device Operation
Circumference
Direction
Erase: DC erase
area
OGB
Data area
IGB
expand
Servo frame
(172 servo frames per
revolution)
CYLn + 1
CYLn CYLn
–
1 (n: even number)
W/R Recovery
Servo Mark
Gray Code
W/R Recovery
Servo Mark
Gray Code
W/R Recovery
Servo Mark
Gray Code
EVEN1
ODD
EVEN2
Post code (particular models only)
PAD
Diameter
direction
Figure 4.7 Physical sector servo configuration on disk surface
4-16 C141-E258