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2.0.0 Disk Drive
2.1.0 THEORY
2.1.1
Introduction
The Disk Drive is permanently mounted in the
system. It has one permanently mounted magnetic-
coated disk. Data is written and read from the
disk by data heads attached to a swinging actuator.
2.1.2
Subframe
The subframe is mounted vertically using three
shock mounts. The shock mounts isolate the disk
drive from the machine frame. Mounted on the
subframe are the disk enclosure (DE) and drive
motor.
Note:
Two styles of subframe are used. The main
difference between the two styles is in the way
wires and cables are guided across the subframe.
In the old style subframe, wires and cables are
guided with screws and plastic clamps; in the new
style subframe, the wires and cables are guided
with slots and guides that are integral parts of the
subframe casting.
2.1.3
Grounding
The subframe is grounded by a ground strap
II
to the machine frame. The drive motor is
grounded by the system ac ground
&11 .
The spindle is grounded to the subframe
by a spindle antistatic brush
II ,
which is part
of the spindle locking arm. The motor armature
is grounded by the motor antistatic brush
rJ
mounted on the brake housing. Old-style disk
enclosures are grounded to the system ground
at
m .
New style ground has disk enclosures
grounded to the system ground as shown below
at
11_
II
A2A3D08
Front View
New Style Grounding
m
Spindle Antistatic
Brush and Locking Arm
Back View
Disk Drive
PDTB1
Old Style Grounding
II
Spindle Antistatic
Brush and Locking
Arm
Back View
Disk Drive
2-1
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