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SECTION 1
GENERAL DESCRIPTION
INTRODUCTION
This manual provides useful information to assist the
customer when incorporating the Tandon rigid disk
drive into a system.
The TM362 and TM262 disk drives are full feature,
compact units that use a pseudo-dosed-loop head posi-
tioning system in conjunction with standard Winchester
technology to store data on 3.5-inch plated media.
Voltage and signal requirements for both drives are iden-
tical to those of Tandon Corporation's standard
5-1I4-inch family of rigid disk drives.
Frame size is the only difference between the TM362
drive and the TM262 drive. The TM362 is designed
to fit in a standard 3.5-inch drive cavity, and the TM262
is designed to fit in a standard 5-1/4-inch drive cavity.
The storage media is contained within the drive in a
fixed, nonoperator-removable configuration.
1.1
SCOPE OF THE DOCUMENT
Section 1 of this manual contains a general descrip-
tion of the TM362 and TM262 disk drives. Section 2
contains the product specifications. Section 3 provides
information on operation of the drives.
1.2
PURPOSE OF THE DRIVE
These drives are rotating disk memory devices designed
for random access data storage and retrieval. Typical
applications include word processing systems, entry
level microprocessor systems, intelligent calculators,
program storage, small business computer systems, and
any application in which low cost, high speed random
access data storage is required.
1-1
1.3
MAJOR FEATURES
PSEUDO-CLOSED-lOOP HEAD
POSITIONING SYSTEM
The pseudo-dosed-loop head positioning system used
in these drives is inherently more accurate than the
traditional open-loop system, yet it does not require a
dedicated servo surface on the recording media. Servo
positioning data is embedded in each Head 0 track, and
the drive uses this data to monitor head location and,
thereby, maintain accurate servo positioning.
MICROPROCESSOR CONTROL
The TM362 and TM262 drives feature an onboard
microprocessor, providing five major functions:
1.
Self-calibration on power-up.
2. Seek timing for the head positioning
mechanism.
3. Write current switching for optimal data recor-
ding quality.
4. Power and track fault detection.
5. Compensation for positioning errors caused by
temperature and mechanical variations.
DAISY CHAIN/RADIAL CAPABiliTY
The circuit board provides address selection and gating
functions that allow a user to daisy chain up to four
drives or configure the drive for radial connection. A
SIP resistor pack is used to terminate the interface. The
resistor pack is removed from its SIP socket on all drives
except the last one in a daisy chain. When a single-
drive system or a radial configuration is used, the
resistor pack remains plugged into the SIP socket.
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