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Q200 SeriesTM
Intelligent Disk Drives
Technical Reference Manual
For Q250, Q280
Disk Drives
Q200 SERIES tm
INTELLIGENT DISK DRIVES

Q250jQ280
DISK DRIVES

Technical Reference Manual

Publication No. 81-45528
REV A
PREFACE
This manual contains technical reference information describing
the Q250 and Q280 rigid disk drives. Information is intended for
technicians and engineers evaluating or maintaining the drives, or
integrating them into systems.

Quantum reserves the right to make changes and/or improvements to its
products without incurring any obligation to incorporate such changes
or improvements in units previously sold or shipped.

Additional information on the Q250 and Q280 is given in the
following~manuals:

Publication No. Title

Quantum 81-45233 Q250/Q280 Disk Drives. OEM Manual
Quantum 81-45416 Q200 Series Programmer's Manual
ANSI X3.131-1986 Small Computer System Interface (SCSI)

Quantum publications may be requested from your Quantum Sales
Representative, or may be ordered from Quantum in the same manner as
spare parts.

Publication No 81-45528 Rev. KL587

UL/CSA/VDE

UL recognition granted under File No. E78016
CSA certification granted under File Nos. LR496896-8 and LR496896-11
VDE certification granted per File No. 11342-3250-1002

WARRANTY

Model Q250 and Q280 disk drives are warranted against defects in
material and workmanship for a period of one year from date of
shipment. The warranty includes parts and labor. This is a limited
~arranty and further details can be obtained from your Quantum sales
representative. All requests for service should be directed to the
Quantum service center in your area.

PATENTS

The product described herein is covered by u.S. Patent No. 4,538,193,
and is the subject of allowed pending patent applications from which
u.S. Patents are expected to issue in 1987.

Copyright 1987 Quantum Corporation. All rights reserved.
Q200 Series and DisCache are trademarks of Quantum Corporation.
AIRLOCK is a registered trademark of Quantum Corporation.
Printed in U.S.A.

ii
TAB L E o F CON TEN T S

PREFACE . . ii

SECTION 1. INTRODUCTION . . . . 1-1

1.1 Features . . . . . . . . . . . . . . 1-1
1.2 Logic Conventions . . . . . . . . . . 1-2

SECTION 2. PRINCIPLES OF OPERATION . . 2-1

2.1 Head Disk Assembly (HDA) . . . . . . . . . ...... 2-1
2.1.1 Base casting Assembly. . . . . . . ...... 2-1
2.1.2 Disk Stack Assembly. . . . . ....... 2-2
2.1.3 Rotary positioner Assembly (Actuator) . . . . . . . 2-2
2.1.4 Headstack Assembly. . . . . . . . . . . 2-2
2.1.S Automatic Actuator Lock (AIRLOCK) . . . . . . . . . 2-2
2.1.6 DC Drive Motor. . . . . . ......... 2-2
2.1.7 Air Filtration. ... . . ......... 2-3
2.2 Drive Electronics. . . . . .............. 2-4
2.2. 1 Disk Format . . . . . . . . . . . ....... 2-4
2.2.2 Simplified Explanation--Block Diagram . . . . . . . 2-4
2.2.3 SCSI Bus Physical Interface. . ...... 2-8
2.2.4 SCSI Bus Signal Descriptions . . . . . . . . . . . . 2-10
2.2.S SCSI Bus Timing. . . . ...... . . 2-11
2.2.6 Power Requirements. . . . . . ...... . 2-14
2.2.7 Shorting Plug Options. . ........... 2-16
2.2.8 Flex Circuit . . . . . . . . . . . . . . . . . . . . 2-19
2.3 PCB Functional Elements. . . . . ........... 2-19
2.3.1 Power-On-Reset (POR) and Warm Reset . . . . . . . . 2-19
2.3.2 Motor Control Circuit . . . . . . . . . . . . . . . 2-20
2.3.3 Electronic Return Spring. . . . . . . ..... 2-21
2.3.4 S080 SCSI Bus Controller. . . . ...... 2-21
2.3.S Servo Control, AMC and Servo AGC. . . . . . .. 2-23
2.3.6 Actuator Positioning circuit. . . . . ..... 2-27
2.3.7 Read/Write Circuit. . . . . . . . . . . . . . . 2-27
2.3.8 FYLO Timing Controller IC, and xtal Oscillators . . 2-29
2.3.9 DICEY Data Controller IC. ........ . 2-30
2.3.10 Microprocessor and EPROM ......... 2-32
2.4 Power-Up Sequence/Recalibration. . .......... 2-32
2.S Read Command Sequence. . . . . . . . . ...... 2-33
2.6 write Command Sequence. . . . . ........... 2-33
SECTION 3. ENGINEERING DRAWINGS . . 3-1

iii
SECTION 4. APPLICATIONS . . . . . . . . 4-1

4.1 Special Considerations. . . . . . .... 4-1
4.1.1 -REQ/-ACK Handshake. . ...... 4-1
4.1.2 Hints for Software Driver writers ... .. 4-3
4.2 Errors and Media Defects. . . . . . . . . . . . ... 4-5
4