SyQuest SQ312RD Installation and operation manual

SQ312RD
OEM
Manual
SyQuest
TECHNO LOGY

TABLE OF CONTENTS
SECTION 1—INTRODUCTION 1
1.1 General Description 1
1.2 Physical Specifications 3
1.3 Reliability Specifications 5
1.*Performance Specifications 5
1.5 Functional Specifications 6
SECTION 2-FUNCTIONAL CHARACTERISTICS . . 7
2.1 General Operation 7
2.2 Read/Write and Control Electronics 7
2.3 Drive Mechanism 8
2.*Door Mechanism/Door Lock Solenoid 8
2.4.1 General Description 8
2.4.2 Opening Sequence Procedure 8
2.5 Positioning Mechanism 9
2.6 Read/Write Heads and Disks 10
2.7 Cartridge Interlock Mechanism 10
SECTION 3-FUNCTIONAL OPERATIONS 15
3.1 Power Sequencing 15
3.2 LED Operation 16
3.2.1 Red 16
3.2.2 Green 16
3.2.3 Orange 16
3.2.4 Slow Flashing Red 16
3.2.5 Rapidly Flashing Red 17
3.3 Drive Selection 17
3.4 Track Accessing 17
3.5 Restore 18
3.5.1 Method 118
3.5.2 Method 218
3.5.3 Method 318
SECTION 4-ELECTRICAL INTERFACE 19
4.1 General Description 19
4.2 Control Input Lines 25
4.2.1 Write Gate 26

TABLE OF CONTENTS (continued)
4.2.2 Head Select 2» 26
4.2.3 Direction In 27
4.2.4. Step 27
4.2.5 Recalibrate 28
4.2.6 Recovery Mode 30
4.2.7 Drive Select 1-4 31
4.2.8 Change Cartridge 31
4.3 Control Output Lines 32
4.3.1 Seek Complete 32
4.3.2 Track 033
4.3.3. Write Fault 33
4.3.4 Index 34
4.3.5 Ready 35
4.3.6 Drive Selected 35
4.3.7 Cartridge In 35
4.3.8 Write Protected 35
4.3.9 Cartridge Changed 36
4.3.10 Radial Index 36
4.4. Data Transfer Lines 36
4.4.1 MFM Write Data 37
4.4.2 MFM Read Data 37
4.4.3 Read/Write Timing 37
4.5 Drive Selected 38
4.6 Option Shunt Block 39
SECTION 5-PHYSICAL INTERFACE 40
5.1 Jl/Pl Connector -Control Signals 41
5.2 J2/P2 Connector -Data Signals 42
5.3 J3/P3 Connector -DC Power 42
SECTION 6—PHYSICAL SPECIFICATIONS 43
6.1 General Description ^3
6.1.1 Mounting Orientation *3
6.1.2 Mounting Holes ^3
6.1.3 Physical Dimensions 43
6.1.4 Air Flow Requirement 4*
6.1.5 Shipping Requirement W

TABLE OF CONTENTS (continued)
SECTION 7—TRACK FORMAT *5
7.1 Gap 150
7.2 Gap 250
7.3 Gap 350
7AGap* 51
7.5 Sector Interleaving 51
7.6 Defective Sector Flags 51
SECTION 8-CARTRIDGE ACCLIMATIZATION .. 52
SECTION 9—CLEANING CARTRIDGE 53
9.1 Materials Required 53
9.2 Procedure 53
9.3 Maintenance 55
SECTION 10 -MOUNTING OPTIONS 56
10.1 General Description Option III 56
10.1.1 Procedure 56
10.2 General Description Option I59
10.2.1 Procedure 60
SECTION 11 -SQ312RD OPTIONS 62
11.1 General Description 62
11.1.1 Write Data Termination 62
11.1.2 Read Data Termination 62
11.1.3 Change Cartridge 62
11.1.* Fault Latch 62
11.1.5 Recovery 62
11.1.6 Recalibrate 63
11.1.7 Auto Recovery Mode 63

LIST OF FIGURES
2-1 Air Filtration System 11
With Switch Locations
2-2 Cartridge Insertion 12
2-3 Cartridge Removal 13
2-* Track Format and Positioning System 1*
4-1 Power-Up Sequence 19
4-2 Control Signals 20
4-3 Data Signals 21
4-4 Typical Connection, 4Drive System 22
4-5 Control Signals 26
Driver/Receiver Combination
4-6 Head Select 28
4-7 Slow Seek Timing 29
4-8 Buffered Seek Timing 29
4-9 Index Timing 34
4-10 Data Line Driver/Receiver Combination .... 36
4-11 Read/Write Data Timings 38
4-12 Option Shunt Block 39
5-1Interface Connector Physical Locations .... 40
5-2 J1Connector Dimensions 41
5-3 32 Connector Dimensions 42
5-4 J3 Connector-Drive PCB Solder Side 42
7-1 Mounting Physical Dimensions 46
7-2 Dimensional View 47
7-3 Track Format As Shipped 48
7-4 "Al" Address Mark Byte 49
9-1C-PAK Instructions 54
10-1Mounting Option Half-Height Option Kit 57
10-2 Mounting Bracket Option Spacing 58
10-3Mounting Bracket Full-Height Option Kit ... 60
11-1Option Jumper 63

LIST OF TABLES
*-l Jl/Pl Connector Pin Asignment 23
*-2 J2/P2 Connector Pin Assignment 2*
*-3 J3/P3 Power Connector Pin Assignment .... 25
7-1 DC Power Requirements V7
7-2 Motor Start Current Requirements £8

SECTION 1
INTRODUCTION
1.1 General Description
The SQ312RD disk drive is arandom access storage
device utilizing removable 100mm disks as storage media.
Each disk surface employs one moveable head to service
615 data tracks. The total formatted capacity of the two
heads and surfaces is 10 megabytes (32 sectors per track,
256 bytes per sector, 122* tracks).
The SQ312RD Model has removable media in the form of
acartridge.
Low cost and unit reliability are achieved through the use
of aband actuator and closed loop stepper head
positioning mechanism. The inherent simplicity of
mechanical construction and electronic controls permits
maintenance free operation throughout the life of the
drive. Both electronic PCB's are mounted outside the
head disk assembly.
Mechanical and contamination protection for the heads,
actuator, and disks is provided by an impact resistant
aluminum enclosure. Aself-contained recirculation
system supplies clean air through a0.3 micron filter. The
spindle and disk act as apump, assuring adequate air flow
and uniform temperature distribution throughout the head
and disk area. The on-board microcomputer does thermal
compensation during power-up. This provides signi-
ficantly greater off track margin and the ability to
immediately perform read and write operations after
power-up with no thermal stabilization delay.
The SQ312RD electrical interface is identical to the pin-
out, data transfer rates, and track/sector formats as
the Seagate ST506/412 or equivalent and insures full

compatibility with awide host of 5ft" Winchester disk
drive controllers. The half-size form factor (half-height)
design allows two SQ312RD drives to fit within the space
of one 5V floppy Winchester envelope, and the DC power
requirements and connector for the SQ312RD are the
same as for the industry standard 5H" Winchester. No AC
power is required.
Key Features
•12.75 Mbyte storage capacity.
•Half-height minifloppy form factor.
•Removable cartridge media that requires no purge
cycle upon power-up.
•Buffered seek mode for faster data access.
•Closed-loop servo system with imbedded digital
servo for full cartridge interchangeability between
any SQ312RD drive.
•Same interface and track format as standard 5J4"
Winchester.
•Utilizes existing 5J4" Winchester controllers.
•Ruggedized for portable systems.
•Same DC voltages and current as the minifloppy.
•Band actuator and .9° stepper motor head
positioning mechanism.
•Data Recovery Mode.
Solenoid controlled door lock.

1.2 Physical Specifications
ENVIRONMENTAL LIMITS
Ambient Temperature:
(operating)
(non-operating)
Maximum Temperature:
Gradient:
(operating)
(non-operating)
Relative Humidity
Maximum Elevation:
(operating)
(non-operating)
Shock:
(operating)
(non-operating)
Vibration:
(operating)
40° to 122°F
(*o to 50°C)
-1*° to 140F
(-10° to 60°C)
18°F/Hr. (10°C)
Below Condensation
8to 80 percent
(non-condensing)
10,000 feet
-1,000 to 35,000 feet
lOG's, 1 1 msec, half sine
40G's, 11msec, half sine
(in shipping container)
2to 10 Hz
0.10" Double Amplitude
10 to 500 Hz
0.5G Peak to Peak