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·1
Figure 3-4. Disk Drive Block Diagram.
(
~
SCSI
A
INTERFACE
"scs
I
v
'"
CHANNEL
~J
RAM
A
BUFFER
...
D
DISK
CONTROLLER
"
SECTORJ
J
INDEX
A
-"
...
..
DATA HEAD
POSITION
SERVO
PROCESSOR
MOTOR
CURRENT
SERVO HEAD
POSITION
SPEED
INFORMATION
MOTOR
CONTROL
C.3SPO.304
3·20 Product Features
ELECTRONICS/
CONTROLLER peA
WRITE CLOCK
WRITE DATA
READ REFERENCE CLOCK
READ DATA
DATA
ENCODER/
...
DECODER
..
r -
- - - -
- -
HDA
MICRO-
I
DATA HtAD
CONTROLLER
I
INTERFACE
HEAD
....
I
ALIGNMENT
I
DATA
' -
r----.:
EADS
---
I
~
"
:----
ACTUATOR
~
DRIVER
---
I
"
==
I
--
SERVO
---
-
SERVO
TIMING
I
HEAD
m
I
HALL EFFECT
SPINDLE
SENSOR FEEDBACK
MOTOR
I
DRIVER
I
"
MOTOR CURRENT
I
DRAFT
10/24/90 11:07
..
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