Servo Track - Fujitsu M2361A Customer Engineering Manual

4.3.3 Servo track format
The servo area is used to store the unique data patterns which generate the
track positioning, index, guard band, and clock signals. This data is
prerecorded on the disk before the unit is shipped from the factory.
The servo area consists of a combination of 01, 02, E1 and E2 tracks.
The magnetized pattern of servo signal is shown in Figure 4.3.5.
r -
Ind ex pu
Ie
r-
Sync pulse
Track abbreviation
r-
Odd 1 pulse
Servo head gap position
r-
Even I pulse
I
I
rOdd
2pul"
02
rEVe.
2 p
N NS SN INs S N NS S
N NS S N NS SN NS S
J
j
j
" It
J
01
V
V
V
~
N NS SN INS~
N ~S S
N Ns S
N INS SN INS~
I
.....
}
1\
It
E2
-
V
V V
V
N
~S
SN NS S N NS S N NS S
N NS ~N NS S
I
-
1\ "
EI
V
V
V ~
~
N NS ~N NS S
N NS S
N ~S
is
N NS SN NS S
I
.....
J
l\ l\
1
Jl1
02
f ~
V V
V
~
N NS ~N NS S N
NS~
N NS S N NS SN NS S
28~m
!
.....
3.255~S
I I
One servo byte
= 8 data bytes
Figure 4.3.5 Magnetized pattern of servo signal and read signal
ulse
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