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1.4.4 Simplified Maintenance
The air-tight, sealed disk/head assembly and the D2246's simplified design produce a
disk drive that requires no periodic maintenance. Neither installation nor field service
requires special tools. Motor electronics are placed outside the head/disk assembly and
do not need "clean room" repair facilities.
An optional diagnostic panel is available for test and maintenance purposes (see Appen-
dix C).
1.4.5 Design Reliability
Lightweight, contact-type start/stop heads that reduce damage to the heads and disks
are used within the D2246 disk drive. A simplified rotary actuator, a directly coupled,
brushless dc motor, and a closed-loop air circulation system are the drive's major
mechanical components. The control logic is microprocessor controlled and designed to
minimize electronic components. This design strategy ensures high reliability and low
cost.
1.4.6 Standard Interfaces
The D2246 uses standard original equipment manufacturer interfaces for connection to a
disk controller and to a power supply.
1.4.7 Safety
The D2246 conforms to Underwriter's Laboratories Safety Regulation UL478.
1.4.8 System Configuration Flexibility
A maximum of four D2246 disk drives can be connected to a single controller in either a
daisy-chain or radial system (see Figures 1-5 and 1-6).
DISK DRIVE CONTROLLER
SG
AO
BO
B1
Bn
r
CABLEA
CABLE B
/
-
\
/
-
\
V
V
-
~
V
-
~
si)
A
IB~
A
IB-
A
Is~
*TERM
*TERM
*TERM
DISK DRIVE
DISK DRIVE
- - -
DISK DRIVE
0
1
4 (maximum)
* TERMINATING RESISTORS INSTALLED ON EACH DRIVE
Figure 1-5 Daisy-Chain System Configuration
1-6
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