SyQuest S0306 User manual

SQ306RD
OEM
Manual
SyQuesi
TEe H N 0 LOG Y

TABLE OF CONTENTS
1.0 Introduction ....................................... " 4
1.1 General Description ............................... 4
1.2 Specification Summary ............................ 5
1.2.1 Physical Specifications ...................... 5
1.2.2 ReI/ability Specifications •.•.••....•.••...••.• 6
1.2.3 Performance Specifications ......•.••...•..•. 6
1.2.4 Functional Specilications ....•....•••....•... 7
2.0 Functional Characteristics .. ........ . .. ....... .... ... 7
2.1 GeneralOperation ••...•.••.•.••.......•.. '.' •. .• .. 7
2.2 ReadlWrite and Control Electronics •••.•..••.••••..• 7
2j3 Drive MechanIsms •. •.. •••. •••••. •.•. . ••. . . . . •. •. • 8
2.4 Door Mechanism ••••••.•••.•••••...•.•••....•.••••. 8
2.5 Air Filtration System ••.•••••.••.•.•.•..••.•.•••••.• 9
2.6 Positioning Mechanism ....................... :..... 9
2.7 ReadlWrlle Heads and Discs •• •. . •. •• . •••. . . . •••• . . 9
2.8 Cartridge Interlock Mechanism (SQ306R Model) •••••• 9
3.0 Functional Operations .. ...... ........... .. .... .. . ... 14
3.1 Power Sequencing ••••••••••••••••••.••.•••..•••.• 14
3.2 Drive Selection •• ••• •••••••••••. •••. . ••. .. •. •. •. •• 15
3.3 Track Accessing " ••••••••. ••••••. . . .•.. . . .. ••.••• 15
3.4 Recallbrale •••••..•.•••••••.•••.•.•.•.....••.••.•• 15
4.0 Electrlcallnterface ................................... 16
4.1 Control Input Lines •••..••.........•...•.•••••.•••. 21
4.1.1 Write Gate •••.. •. •. . .. •. ••. . .•. •• •••••. •. •• 22
4.1.2 Head Select 20 ••••••••••••••••• , ., • • •• • •• • • 22
4.1.3 Direction In •. . •••. ••••. •. •. •. .. •. . . . .••. . •• 23
4.1.4 Step ••.•..•••••.••..••.•.•••..••...•....... 23
4.1.5 Drive Select 1-4 ••••.•.••.••....•.........•. 25
4.1.6 Change Cartridge ........................... 25
4.2 Control Output Lines ••••.•.•••.•••.......•..•..•.. 26
4.2.1 Seek Complete
26.
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4.2.2 Track 0 .. . . . . . .. .. . . .. . . .. . .. .•. . •. . . . . .•. • 26
4.2.3 Write Fault ...........••....•.•.•••......... 27·
4.2.4 Index ......•......•...•...•.......••.••...• 27
4.2.5 Ready ......•.•.....••.•.....••....•.••••.. 28
4.2,6 Drive Selected .•.....•.••......••.••.•.•.••. 28
4.2.7 .Cartridge In .••....•.•......•.....••..•..•.. 28
4.2.8 Write Protected .•....•..•.•.•...••••.••.••.• 28
4.2.9 Cartridge Changed .......................... 28
4.2.10 Radial Index ••..•..••.•.....••...•..•.•.••.. 28
4.3 Data Transfer Lines ...........••...•••••.••..•...•• 29
4.3.1 MFM Write Data ••...•.•..•••••••..••.••••.• 29
4.3.2 MFM Read Data ....•••••...••.•.......••••• 30
4.3.3 Read/Write Timing ...•......•......•.•...... 30
4.4 Drive Selected .•......•..•.•..•..••••..•••.•••.••. 31
4.5 Option Shunt Block .................. • .. . .. ...... • 31
5.0 Physlcallnlerface .....•.............................. 32
5.1 Jl/Pl Connector-Control Signals .•.•.•.•.•••.•.•..• 32
5.2 J2/P2 Connector-Data Signals ...................... 33
5.3 J3/P3 Connector-DC Power ........................ 34
6.0 Physical Speclflcallons ...................... :........ 35
6.1 Mounting Orientation .............................. 35
6.2 Mounting Holes .• . •. . . .. . .. . . .•. . •. . .•• ••. ••. •.•• 35
6.3 Physical Dimensions ....••...•.• ••. •••••. . . .•. ••. • 35
6.4 Shipping nequlrement .....•..•...••.••••••..•.•.•• 35
7.0 Track Formal .. . . . . . . . •. . . •. . ••. . . ••. . •. •••• •. . • . . . . . 35
7.1 Gap 1 .............••...........•.••..•..•.......• 39
7.2 Gap 2
7.3 Gap 3
39
39
7.4 Gap 4 ..............•..•.•...•.....•.•••••..•....• 39
7.5 Sector Interleaving .......•......••.......•..•....• 40
7.6 Defective Sector Flags .......•....•......•.•.....•. 40
8.0
Cartridge Accllmallzallon ......... . . . . . . . . . . . . . . . . . . . . 40
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Figures
1A Air Filtration System with Switch Locations ......... 10
1B Cartridge Insertion •.•..••...•........•........... , 11
1C Cartridge Removal ............................... 12
2 Track Format and Positioning Mechanism ..•....•... 13
3 Power Up Sequence •••.•...•..••................. 16
4 Control Signals ••••••..•..•...•.........••....... 17
5 Data Signals ••••.•••••••.••..•••........•••...... 18
6 Typical Connection, 4 Drive System •...•.•.•.•.•... 19
7 Control Signals Driver/Receiver Combination .. . .. . . 22
8A Slow
Seek Timing •••.••••••••••.•......••••.•.•.. 24
8B Buffered Seek •••••••••••••••. •••••. . .•••••.. . . •. 25
9 Index Timing ••••. ••••••. ••••. •.. ••. •••••. . •. •••. 27
10 Data Une/Driver/Receiver Combination •••.•.•. :. . . . • 29
l1A Read/Write Data Timings .......................... 30
11B Option Shunt Block .............................. 31
12 Interface Connector Physical Locations ••••.•..•••.• 32
13 J1 Connector Dimensions ......................... 33
14 J2 Connector Dimensions ......................... .33
15 J3 Connector-Drive PCB Solder Side ••..••••.....•. 34
16 Mounting Physical Dimensions .•.... •. . ••••. •. . •. • 36
17 Dimensional View •••••••.•.•••.•••.••.••..•.•...• 36
18 Track Format as Shipped .......................... 38
19 "A1" Address Mark Byte .... ...................... 38
Tables ,
JlIP1 Connector Pin Assignments ••••••.••.•.•..••• 20
II J2/P2 Connector Pin Assignments
............•..... 20
III J3/P3 DC Connector Pin Assignments
.• :........... 21
IV DC Power Requirements •••••••....•...••••.......• 37
V MotorStart Current Requirements ....•.......•.•... 37
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1.0 Introducllon
1.1 General Description
The S0306 disc drives are random access storage devices
utilizing removable or fixed 100mm discs
as storage media.
Each disc surface employs one movable head
10 service 306
data tracks. The tolal formalled capacityofthe twoheads and
surfaces is 5 megabytes
(32 sectors per Irack. 256 bytes per
sector, 612 tracks).
The S0306R Model has removable media In the form
of a
cartridge; the S0306F Model has fixed media.
Low cost and unit reliability are achieved through the use ofa
band actualor and closed loop stepper head positioning
mechanism. The Inherent simplicity of mechanical construc-
tion and electronic controls permits maintenance free oper-
ation throtlohotllthe Iile of the drive. Bolh electronic PCB's
are mounted outside the head disc assembly.
Mechanical and cop'::mlnatlon protection forthe heads. actu-
ator. and discs is provided by an Impact resistant aluminum
enclosure. A self contained recirculation system supplies
clean air through a
0.3 micronfiller. The spindle and disc act as
a pump assuring adequate air flow and uniform temperalure
distribution throughout the head and disc area. The onboard
.microcomputerdoes thermalcompensation duringpowerup.
:This provides significantly greater off track margin and the
.ability to Immediately perform read and write operations after
power up with
no thermal stabilization delay.
The
S0306 electrical interface is Identical to Ihe pin-out.
<lata transfer rates, and software track/sector formats as
the Seagate ST506/412 or equivalent and Insures full compati-
bility wilh awide host of 5 W' Winchesterdisk drivecontrollers.
The half-size form factor (haU-helght) design allows two
S0306 drives to fil within the space of one minifloppy or 5W'
Winchester envelope. and the DC power requirements and
connector for the S0306 are the same
as for the Industry
slandmd minifloppy. No AC power Is required.
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KEY FEATURES
I< 6.38 Mbyte storage capacity
* Hall-height minifloppy form lactor
I< Removable cartridge media IIml requires no purge cycle
upon power-up (S0306n Model)
I< Bullered seek mode lor laster data access
I< Closed-loop servo system with imbedded digital servo lor
full cartridge interchangeability between any S0306n drive
I< SameInterface and track format as standard5 W' winchesler
* Utilizes exlsling 5\1'" winchester controllers
* Ruggedized for portable system designs
* 5.0 megabillsecond transfer role
* Same DC voltages and current as Ihe minifloppy
* Band actuatorand .9' stepper motor head positioning
1.2 Specification Summary:
1.2.1 Physical Specifications:
Environmental LImits:
Ambient Temperature
Operating:
40' 10 122'F (4' to 50'C)
Non-Operating: -14' 10 140·F (-10· 1060·C)
Max. Temperature Gradient
Operating: 18'F/hr. (10·C)
Non Operating: Below Condensation
Relative Humidity: S
10 sr::, non-condensing
Maximum Elevallon
Operating: 10,000 fl.
Non-Operating: -1000 1035,000 It.
Shock
Operating: 10G's
Non-Operating: 20G's (in shipping container)
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DC Power Requirements
+12V ± 5%@.7 amps
+5V ± 5%@.9 amps
+12V/+ 5V Maximum Ripple 50 mV Peak-Peak
Mechanical Dimensions:
Height
........................ 1.625 Inches
Width .......................... 4.8 Inches
Depth .......................... 8.0 Inches
Weight ............................ 2.4 Ibs
Shipping Weight .................... 4.3 Ibs
Cartridge Mechanical Dimensions:
Height
.. . .................... 0.43 Inches
Width ......................... 4.33 Inches
Length ........................ 4.41 Inches
Weighl
............................ 0.3 Ibs
Heat Dissipation
13 walls (45BTU/Hr) maximum
1.2.2 Reliability Specifications:
MTBF
............ 11,000 POH, typical usage
PM ......................... Not Required
MTTR
.........•............... 30 minutes
Component Design Life
•............. 5 years
Error Rates:
Soft read errors
........... 1 per 10
9 bits read
Hard read errors
......... 1 per 10
12 bits read
Seek errors
.................. 1 per 10
6 seek
Note: Error
rate performance achieved with an available
MFM data window of greater than
80 nsec.
1.2.3 Performance Specifications:
Capacity
Unformalled
Per Drive
Per Surface
Per Track
Formalled
Per Drive
Per Surface
Per Track
Per Sector
Sectors per Track
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6.38 Megabytes
3.19 Megabytes
10416 Bytes
5.0 Megabytes
2.5 Megabytes
8192 Bytes
256 Bytes
32

Transfer Rate 5.0 MlJits/sec
Access Time MIN MAxt
(Includes settling)
Track to Track
25
94
Average' 90 161
Maximum' 205
276
'using buUered seek
Average Latency 8.46ms
1.2.4
Funclfonal Speclflcalfons:
Rotalfonal speed 3547 rpm ± 1%
Recording density 12000 bpi max
Flux density
12000 fcl
Track density
435tpi
Cylinders 306
Tracks 612
RIW Heads 2
Discs 1
Index
tACCESS TIMES
To guarantee 100% Interchangeability of cartridges between
drives, the 306R Model uses a
ur 'que Imbedded digital servo
scheme (Dlgilok'·).This results in a variance of access limes
which Insures the customers data integrity.
2.0 Functional Characteristics
2.1 General Operalfon:
TheS0306discdrive consists ofread/write, servo, and control
electronics, read/write heads, track positioning actuator, and
air filtrallon system. The Model S0306R also
has a cartridge
Interlock mechanism. The components perform the following
functions:
1. Interpret and generate control signals
2. Poslton the heads over the desired track
3. Read and write data
4. Provide cartridge Interchangeability for S0306R Model
2.2 Read/Write and Control Electronics
Electronics are packaged on two printed circuit boards. The
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primary board to which power, control and dala signals are
connected Includes:
1. Index detecllon circuit
2. Head position/actuator circuit
3. Read/write circuits
4. Drive up to speed detector
5. Head select circuit
6. Write 'ault detection circuits
7. Servo decoder and control
8. Stepper motordrive circuit
9. Drive select circuit
10. Track zero detector
The second PCB, mounted at the rear
of the drive derives Its
power 'rom the primary board and provides powerand speed
control
to the spindle drive motor.
2.3 Drive Mechanism
A brushless DC drive motor rotates the spindle at 3547 rpm.
The spindle
Is drivendirectlywith nobelt or pulleybeing used.
The motor and spindle are dynamicallybalanced to Insure a
low vibration level. Dynamic braking (306R only)
Is used to
quickly stop the spindle
motor when power Is removed. The
head/disc assembly
Is shock mounted to minimizetransmis-
sion of vibration through the chassis or frame.
2.4 Door Mechanism (S0306R Model only)
The S0306R
door mechanism Is shown In Figure 1 C. The
opening sequence
Is as follows:
1. Depress front panel switch. This cuts off 12 volts of power
to the spindle motor while the microprocessor moves the
heads to track
000 positon and cuts off power to stepper.
2. Front door automatically opens partially.
3. Walt until front panel light stops flashing, and manually
open
door to right angle position with 'ront opening. Car-
riage then moves to retract position
at outerdiameter, the
heads unload and the cartridge Is lifted off the spindle by
the cartridge guides.
-8-

4. Depress fully opened Ironl doorand cnrhidge ejecls. Nole
Ihallhe fronl door will relum 10 righl angle posiliofl when
pressure is released.
2.5 Air Fillralion Syslem
The discs and read/wrile headsare fully enclosed inamodule
using
an inlegralrecirculallon airsyslem and absolute filler 10
malnlalnaclean environment. The lolaIairvolumeof Ihedrive
and carlridge
Is purged Ihrough the absolule filler once per
second. .
2.6 Positioning Mechanism
The read/wrHeheads
are mounledon aball bearing supported
carriage which
Is positioned by a band aclualor conllecled 10
Ihe slepper molor shall. The cfrive uses a microslepplng
slepper posilloner which sleps al 0.90 per slep Inslead of Ihe
1.8
0
of a conventional slepper. The closed-loop embedded
servo controldesign exlendsIheaccuracyofIheS0306melal
band posilloner to 75 micro-Inches. The embed~ed bursl
servoscheme, whereservocontroldataresides wilhlnasingle
wedge per track, affords users full definilion control
01 sector
formats.
2.7 Read/WrHe Heads and Discs
The recording media consists
of a single, 100mm "Ihln film"
melallic alloy plaller. The glass-like carbon overcoat thai pro-
tects the magnetic subslrale makes Ihe Ihln lihn discs Imper-
vious to environmental conlamlnents such as dusl, smoke
particles and ambient humidity,
as well as "head crashes" Ihat
could result fromloslllngorsharp movements
of an operallng
system. The carbon overcoat also eliminates Ihe need for
extended purge cycles; and coupled with the low load for-
cellow mass flying heads, permits reliable contact starVstop
operation and exceedingly high durability.
Data on each of the two disc surfaces is read by a read/write
head, each
of which accesses 306 tracks. The 50306 ulilizes
Industry standard
ferrHe heads.
2.8 Cartridge Inlerlock Mechanism (50306R Model only)
The fall-sale cartridge Inlerlock mechanism ensures proce-
dural compliance by users
as the cartridge is only perl11illed
10 be inserled in the appropriale posilion. The inlerlock
mechanism disengages the ferrile heads from the media
upon opening Ihe front door.
-9-

FIGURE 1A
AIR FILTRATION SYSTEM WITH SWITCH LOCATIONS
CASTING
CARTRIDGE EJECT MECHANISM
SPINDLE
MOTon
WRITE
ENABLE
SWITCH
"CARTRIDGE
IN"
SWITCH
INDEX
TRANSDUCER
ffi3¥§?¥~: I'":'~ FRONT
-DOOR
ct;=I l SWITCH
-10-

FIGURE 18
CARTRIDGE INSERTION
FRONT PANEL SWITCH
-11-
pnEssunE SHOULD 8E
APPLIED
TO THIS nEGION
FOn ENGAGEMENT
FRONTDoon

FIGURE 1C
CARTRIDGE REMOVAL
L..----
DO
-
OR
CLOSED-.t.....JI.}\
I
DOOR PARTIALLY OPENED BY
SPRING DETENT
·1.
DOOR OPENED MANUALLY
DOOR IS PARALLEL WITH
DRIVE
FOR INSERTION:
SLIGHTLY BENT BEYOND
PARALLEL FOR EJECTION
-12-
PUSH FRONT PANEL SWITCH
TO OPEN
.... ~ ~O·
..... ~
I

FIGURE 2
TRACK FORMAT AND POSITIONING SYSTEM
~_-....--- TR K-012
~_--...--TRK-004
~TRKOOO
0.0. GUARD BAND (TRACKS-OOI TO -012 EXCEPT -004)
-----I REPEATED B TIMES"
EVEN TRACKS SERVO BYl;ES
ODD TRACKS SERVO BYTES
1.0. GUARD BAND(TRACKS 307 TO 318)
"TRACK -004 INDEX TO INDEX
-13-

3.0 Funcllonal Operallons
3.1 Power Sequencing
i 5 and +12 valls may be applied In any order; however, +12
volts musl be applied 10 slarllhe spindle drive molar. A speed
sense measures this Index time to within
2% ofspeed. After the
spindle drive motor reaches operating speed, the on-board
microcomputer Initlales a calibration procedure. The proce-
dure follows:
a) Seek to Irack minus 4.
b) Read Ihe prerecorded Reference Irack on the cartridge.
c) Divide the 306 cylinders on the cartridge Inlo 20 different
zones.
d) Seek to each zone, read Ihe servo Information, and slore
head offset values
In memory.
e) After all 20 zones have been read successfully, seek to
track
O.
f) Set TRACK 0, SEEK COMPLETE and READY.
If the drive Is unable 10 read the reference track, the spindle
motor will power down and the LEO on the front panel will
flash. Theoperatorshould remove and reinsert the cartridge. It
Ihedrive Is unable 10 read servoInformationduringthelonlng
process, Ihe heads will not seek to Ihe next lone. If Ihls
happens, the drive will never come READY. The drive will not
perform read, write
or seek functions until READY becomes
true.
DuringIhe powerupsequencing the microcomputermonitors
the WRITE FAULT condition. If a WRITE FAULT
Is delected,
the spindle motor will power down. (Reference Paragraph
4.2.3). The controller can also cause a WRITE FAULT condl-
lionif Drive Select and Write Gateare true duringthe powerup
sequencing.
-14-

3.2 Drive Selection
Drive selection occurs when one of the DRIVE SELECT lines
Is activated. Only the selected drive will respond to the input
signals. and only that drive's output signals are then gated to
the controller Interface. (See section
4.5 for exception; See
Figure 11 B for jumpering of drive select.)
3.3 Track Accessing
Read/write head positioning
Is accomplished by;
a) Deactivating Write Gate.
b) Activating the appropriate Drive Select Une.
c) Being In the READY condition with SEEK COMPLETE true.
d) Selecting the appropriate direction.
e) Pulsing the Step Une.
Each step pulse will cause the heads to move either 1track In
or 1 track out depending on the level of the Dire~tion line. A
low level on the Directionline will cause aseek inward toward
the spindle; a high. outward toward track
O.
3.4 Recalibrate
The
controller can cause the drive to recalibrate to track 0
by
anyone of three methods.
3.4.1 The cont'roller can execute a buffer seek command
and Issue
307 or more step pulses. This will cause the
drive to slew to track
O. The Direction control line is
ignored
during this operation.
3.4.2 The controller can execute a buffer seek command
and Issue step pulse greater than the available tracks
In the direction requested. This will cause the drive to
slew to
TRACK O.
3.4.3 The controller can execute single track seeks
towards the O.D. while checking for
TRACK 0 alter
each SEEK COMPLETE.
The procedure described In Par. 3.4.1 Is recommended for
maximum drive performance.

4.0 Electrical Interface
The Interface to the 8Q306 can be divided into three categories.
each of which is physically separated.
1. Control signals.
2. Data signals.
3. DC power.
All control lines
are digitalinnature (open collectorTTL) and either
providesignals to the drive (input)
or signals to the host (output) via
InterfacecOllnection J1/P1. The data transfersignalsare differential
in nature and provide data either to (write) orfrom (read) the drive
via J2/P2 (defined by EIA R8-422).
FIGURE 3
POWER UP SEQUENCE
CARTRIDGE ,..---..:.I_-_2_6_S_EC_._T_VP_IC_A_L_--.:- _____ _
IN I
DC ON I ~~~I--l-0-S-EC--TY-P-IC-A-L--~---------
S~IN MOTOR ON I
DISC UP TO SPEED
RECALIBRATION PERIOD
.
-TRACK d :
___________ -;' SERVO INITIALIZATION
-READY
I PERIOD
-SEEK COMPLETE
-DRIVE SELECT
Table I through III and Figures 4 through 6 show connector pin
assignments and Interconnection of cabling between the host con-
troller and drives.
-16-

•
FIGURE 4
CONTROL SIGNALS
HOST SYSTEM FLAT CABLE on TWISTED PAin
20 FEET MAXIMUM
-CHANGE CARTRIDGE*
RESERVED (HEAD 22)
-WRITE GATE
-SEEK COMPLETE
-TRACK 0
-WRITE FAULT
-HEAD SELECT 2·
RESERVED (TO J2 PIN 7)
-RESERVED (HEAD2')
-INDEX
-READY
-STEP
-DRIVE SELECT 1
-DniVE SELECT 2
-DRIVE SELECT 3
-DRIVE SELECT 4
-DInECTION IN
"-
" *JUMPER OPTION
-17-
~
8Q306
1
2
3_
"
6
5-
7-
8
9-
10
12
,11-<
;
14
13-<
15'"
16
18
11 ...
20
19 ...
Jl/Pl
22
21'"
23 ...
24
25...
26
27
...
28
29
-<
30
32
31-<
33 ...
34
-=:-
i,.. ,

HOST SYSTEM
,
:
-==
-
FIGURE 5
DATA SIGNALS
FLAT CABLE OR TWISTED PAIR
20 FEET MAXIMUM
-DRIVE SELECTED
RESERVED
-WRITE PROTECTED
RESERVED (TO
Jl PIN 16)
-CARTRIDGE CHANGED·
-CARTRIDGE IN
it'll.'
tMFM WRITE DATA
-MFM READ DATA
GND
tMFM READ DATA
-MFM READ DATA
GND
-RADIAL INDEX
.JUMPER OPTION
-18-
SQ306
1
2-
3
4~
5
6-
7
6-
9
10
11_
12 -
13
14
15-
16 -'
17
16
19_
20
~
-

FIGURE 6
TYPICAL CONNECTION, 4 DRIVE SYSTEM
HOST
rl,
I,
CONTROL
r-
f-I
...
Jl
r J2
L DRIVE
111
r J3
L
CONTROLLER
L
Jl
r J2
L DRIVE
112
r
J3
...
,
~-------
...
J1
r-
J2
l-
I,
..
DRIVE 113
f-I L J3
I-t
~
I-t
DATA
~
SEPARATOR r
L
Jl
h r
J2
f-I
I-
DRIVE 114
r
L J3
DC VOLTAGES -
-19-