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FD1O35 
3.5" FLOPPY DISK DRIVE 


PRODUCT DESCRIPTION 


REV. 2 


NEC Corporation 


PROPRIENTARY NOTICE 


The information and design disclosed herein were originated 
by and are the property of NEC Corporation. NEC reserves 
all patent, proprietary design, manufacturing, reproduction 
use, and sales rights thereto, and to any article disclosed 
therein, except to the extent rights are expressly granted 
to others. The foregoing does not apply to vendor 


proprietary parts. 


Specifications remain subject to change to allow the 


introduction of design improvements. 


Copyright 1984 
NEC Corporation 
Printed in Japan 









<a Prepared in March 1984 


Prepared in July 1984 


- ii - 


CONTENTS 


PRO PRIENTARY NG TT © Bite e-Coser's. 2.8 Se Sete aw ng Lee ieve vee tale 208%. Ri S-BUS oa oa herer se i 


CONTENTS... cc cece cee e wean ereve eoeoceoeresrevoeee eee eee eee eee ee eee . Lii 
l. GENERAL ba L 


2. GENERAL SPECIFICATION eeeeeenseteenvreersteoeseeeeeeeeeveeneweeeeees 2 


2.1 Drive Specifications -ésc esac cave cee ee ee eee eee. 
22 Beivye SEUruceure:. 6)3c Gen we oo dae ea wt ae te es 
203 PVIVEe OPSESCION #50 dedi awicd aie ees Seeal ee ewes 


2.4 Disk SPeCltications: 4.4.00 tan esse eee eaeee ed. wee ie 


Oo Oo nN WwW WN 


2.5 Disk: Struc HUTS: sien Os eevee ee eemeeee oe oeee 


3. INTERFACE eoeoen ee ewe vn ee eee ee eee eseeeeeoevneeseaeeneeneeenenenese 11 


3.1 General ‘DeSCription se s45 50 tele ceases kee eee LE 
3.2 Physical Specifications “160056 veeesecsigesntdovse 13 
See Signal Types and Pin Configuration .......... 15 
3.2.2 Power Connector and, Pin Configuration ....... 16 
3e2%.3 CONNECUOY “TVPG .2265.6ts. os ea Se weiotease dt eee tei LT 
S63 Electrical Specifications: sc.taseeenceetwe sae ws 18 
3 Bak SLA tal. BSVe lk. wee aie wee oe ee eg area eg eae OLS 
3.3.2 Driver/R6OCOlvet 2.0 steewan cud be wloweucae wooden, KIS 
3.4 ENPUC SIGNALS: esi wise egies bee ce hee Seka ewer Gee. 20 


3.4.1 DRIVE SELECT 0 to 3 (DSO to 3) ...... seeecece 20 


- iii - 


3.4.2 HEAD LOAD (HDL) (Option Signal) ........... -- 20 


3.4.3 STEP (STP) ...... itveetennaMduonteds csewe wes, 20 
3.4.4 DIRECTION SELECT (DIR) .....2c ccc cece cncccevee 21 
3.4.5 SIDE SELECT (SSL). 2... cece cer evervccccccccacecss 21 
3.4.6 WRITE GATE (WGT) 2.2.2.2 ccc crc r wc crc nce c cece 22 
3.4.7 WRITE DATA (WDT) 2c. ccecccccccccvce ee er ee ee 
3.4.8 MOTOR ON (MON) ...-.eeeeee aaa ees CY neceepemaat 23 
3.5 Output Signals ..ccecseeeveeeracceee eoccseeesee 24 
3.5.1 INDEX (IDX) ....... ivealsbaiea aera piecicaeme: 2A 
36542 TRACK 00 (TKO) .......- tenes eens (ites, 24 
3.5.3 READY (RDY) 2... 2c ccc e cece rere e rnc een c nese neene 25 
3.5.4 READ DATA (RDT) 2.2. - cece cer ccer cnc cccasecccce - 25 
3.5.5 WRITE PROTECT (PRT) 2... cc cccccccvvccrcveca set . 26 
3.6 Interface Signal Timing: miiecwsec aces Siuncastewese 227 
32601, “‘Stépoand Track 00) s.0cucqeleses wees hehe OF 
3.6.2 Access Timing sss saachiautiacGasl ated ae eeeenan 27 
32653 Write fining SSaew es bide Boats er ee! 6h ele waa eaeeeen : Ale 
(3.6.4 Read TIMING «<0. ovau eave ewe Saha We Be ate iteagaras 28 
3.665 Write Data Timing .....sccccccccsccscccccees ~ 29 
3.6.6 DRIVE SELECT and Output Signal Timing ....... 29 
a7 Power Interface 2... cccervccervnccnccesnscvece 30 
3.7.1 Input Power specifications pred Wala e kate eee Se - 30 
OPERATING PROCEDURES .... ccc ce cr ccc ree sre cencecccccees 31 
4.1 Setting a Floppy Disk ....ceeccccrerccccees eewee odds 
4.2 Removing the FlLOppy DISK ..60 siwis eae bade ee Sew ee 31 


- iv - 


4.3 Display Lamp eaeoeoeveevee eee wpnevoeeveeeeeeee eevee eeeoee 


EXTERNAL SHAPE AND INSTALLATION ....-.-eeceeceecccccss 


5.1 External Shape and Fitting Hole Positions ..... 


5.2 Installation a ir a ae a ee 


5.3 Recommended Air FLOW ...cccecccncccsrecvessseccs 


PACKING AND TRANSPORTATION ...c-2eccesnercscccccccres 


31 


32 


32 
33 


34 


35 


GENERAL 


“The FD1L035 micro-floppy disk drive is a 


double-sided micro-floppy disk drive with 135 


tracks per inch (TPI). 


The Micro-floppy disk (abbreviated as disk in this 
Manual) used for the FD1035 is contained in a hard 


jacket with auto shutter. 


The FD1L035 micro-floppy disk drive has a total 
volume one fourth that of conventional 5-1/4" mini- 
floppy disk drives and weights only approximately 


680 g, yet has a comparable storage capacity. 


The drive uses a direct-driven spindle with a 
brushless DC motor, and by to the low power design 


it consumes only 4.5 watts of power. 


The low noise design assures silent operations. 


In this manual the FD1035 micro-floppy disk drive 


is abbreviated as FDD. 


26 GENERAL SPECIFICATIONS 


2.1 Drive specifications 






Item Specification Unit 


=| __ mode 







Capacity | Unformatted 
Formated 


ata transfer rate 125 k-bit/sec. 


int 


8717 


aximum bit density 


racks 









Average rotational speed 


~! 


Seek time 
(Track-to-track) 


Seek settling time 


Head load time 


Track density 


eo 
o 


Start time 0 


he 
to 


Standard | Width 







external 
dimen- Height 101.6 
sions 


(NOTE 1) | Depth 













14 | Operating 4%~ 46 
environ- 


ment 


Temperature 


Relative 20 ~ 80 


condi- humidity 

tions 
Maximum 29.0 
wet-bulb (no bedewing) 
temperature 


CS ae 
Voltage (Vv) Startup current) Steady-state 
(NOTE 1) current (NOTE2) 


Power dissipation 

(NOTE 2) 

Heat output keal/h 
(NOTE 2) 


Reli- MTSF (NOTE 3) 12000 (Under standard 
ability use condition) 


Device life 15000 POH or 5 years 
(Design life) 
Retryable (Not including 2 Times/bit 
or less retry attemps) 
Unretryable 10>" Times/bit 
error ratio 
Seek error Times/seek 
ratio 
Disk life Pass count/ an ox 10° 
track 
Disk Double sided 3.5" 
; diskette specified by NEC 
Drive Operating Non-operating Transporting | Unit 
environment (Storage) (Packing) 
Temperature 4% 46 -20 ~ 50 -40 % 60 °¢ 
(39 © 115) (-4 © 122) (-40 © 140) (°F) 
Relative 20 © 80 10 ©“ 90 5-95 
humidity 
Maximum 45 °C 
wet-bulb ae aie (113) (°F) 
temperature 


Largest 36 30 °C/h 
ea (86) (86) (°F/h) 







































temperature 
grandient 





a 


















2 2 







Allowable 0.5 

vibration (Less than (Less than (Less than 
(Except at 100 Hz) 100HZ) 100 H2) 
resonance 


point) 


Allowable 
shock 

(Less than 
10ms) 


NOTE 1: Value at the time of spindle motor start-up. 


NOTE 2: Average value of current consumption taken 


when FDD IS READY. 


NOTE 3: Under standard use conditions 


(1) Device service 8 h/day 


time (POH) 


(2) Actual head load : 0.5h/day 


time (R/W time) 


(3) Head load count 


240 times/day 


(4) Disk insertion/ : 25 times/day 


ejection 


(5) Motor ON/OFF : 300 times/day 


(6) Average use time : 2h/day 


per disk (4 disks/day.drive) 


Drive structure 


The major component of FDD have the following 


functions: 


(1) 


(2) 


(3) 


(4) 


(5) 


(5) 


Base. 


Constructs the frame. 


Spindle motor assembly 


Drives the disk using a DC spindle motor. The 


“disk is secured to the spindle with a magnet 


and is driven by a driving pin. 


Head carriage assembly 

Contains a pair of magnetic heads facing 
across the medium. The R/W gap of the head on 
side one is dislocated 8 tracks inner than 


that of the head on side zero. 


Step motor 


Moves the carriage assembly via the steel band. 


Head load assembly 
Brings the magnetic head into contact with the 


disk in read/write operations. 


Index sensor 
Optically senses the index point attached to 


the spindle motor. 


(7) Track 00 sensor 
Optically senses that the magnetic head is at 


track OO. 


(8) Write protect sensor 
Optically senses whether the write-protect 


hole in the disk is open or closed. 


(9) Eject mechanism 
Used for insertion and removal of disk and for 


automatic shutter control. 


(10) P.W.B 
Mounts the electric circuits that controls 
positioning of magnetic head, read/write 


operations, etc. 


(11) Disply lamp 
A LED is provided for display of the FDD 


status. 


(12) Front panel 


Dress panel installed on the Drive front. 


Drive Operation 


When a diskette is inserted into the FDD, the disk 
starts rotating and is chucked to the spindle. The 
FDD becomes ready when the spindle motor reaches 
the specified rotation speed after it was turned - 
on. If the drive is selected, it transfers a READY 
signal to the controller. It takes approximately 


800 ms for the spindle motor to become ready. 


Then FDD moves the magnetic head to a target track 
for positioning according to the STEP pluse and 


DIRECTION SELECT signals sent from the controller. 


FDD brings the magnetic head into contact with the 
disk by the MOTOR ON signal from the controller and 
selects the desired magnetic head by the SIDE 
SELECT signal. Now FDD is ready for read/write 


operations. 


For a write operation, the FDD converts into a 
Magnetized pattern the WRITE DATA signal which is 
the serial data sent from the controller and 


records on the disk. 


For a read operation, FDD detects a magnetized 
pattern recorded on the disk, converts it into 
serial data, and sends to the controller as a READ 


DATA signal. 


2.4 Disk Specifications 





a 


(is? (ua ee 3.5" double sided medium 
specified by NEC 
| 2 | product name product name NEC micro floppy disk 
i aes eee ae 
5 NS, 


5 Number of total tracks 
per disk 


om 


Relative 8% 80% 
humidity 


Wet-bulb 29°C Maximum (84°F) 
temperature 


Temperature 20°C/h Maximum (36°F/h) 
gradient 

External 4000 A/m (50 oersted) or less , 
Magnetic field 


Standing Leave the disk at least 30 
minutes in the device 

perating environment before 
use. 















Operating 
environment 
conditions 

















Disk Structure 


The floppy disk is contained in a hard jacket 
withinside of which liner sheets are provided for 
disk surface protection. The disk aaee a 
polyethylene terephthalate base coated with 
magnetic layers. The liner consists of unwoven 
cloth and protects the disk surfaces from scratch 


or dust. The hard jacket is made of ABS resin. 


The disk has a metal hub which is used to secure 
itself to the spindle. The hard jacket has a 


write-protect hole and automatic shutter. 


The disk construction is shown in Figure 2.1. 


Figure 2.1 shows the disk strucutre. 


94 





90 


Fig. 2.1 Disk Structure 


Se ee es 


3. 


3. INTERFACE 
i General Description 


FDD's may be attached to its controler in either 
parallel or daisy-chain configuration. The number 
of FDD's which can be attached to one controller 
depends on dividual system and controller. For 
daisy-chain attachment, each controller can control 


up to 4 FDD's. 


Signal line termination resistors are provided on 
each FDD. The basic FDD attachment to the 


controller is shown in Figure 3.1. 


(a) Parallel attachment 


Signal cable 


Controller 


Power cable 





Terminating 
resistor 


- ll - 


(b) Daisy Chain attachment 







Signal cable 





Controller 





Power cable 
R: Terminating 
resistor 


Fig. 3.1 Basic Connection Modes 


Physical Specifications 


The FDD is attached to its controller through a 
signal connector and a power connector. A faston 
terminal is provided for frame ground. The 


connector locations are shown in Figure 3.2. 


- 13 - 


Faston terminal 






Signal connector 
receptacle. 


Signal connector 
plug 


AA 


Power connector 
receptacle 


Power connector 
plug 





Fig. 3.2 Connector Locations 


14 - 


Scaes Signal Types and Pin Configuration 


The following shows the signal connector pin 


configuration on the FD1030: 


PWB part 
surface 


PIN No. 2 PIN No. 34 


PIN No.1 





Signal name I/O Pin Pin Signal name 
. number | number 
GND 


RESERVED 

(HEAD LOAD/IN USE) 
DRIVE .SELECT 3 
INDEX 

DRIVE SELECT 0 
DRIVE SELECT 1 
DRIVE SELECT 2 
MOTOR ON 
DIRECTION SELECT 
STEP 

WRITE DATA 

WRITE GATE 

TRACK 00 

WRITE PROTECT 
READ DATA 

SIDE SELECT 
READY 


Input signal 
Input signal 
Output signal 
Input signal 
Input signal 
Input signal 
Input signal 
Input signal 
Input signal 
Input signal 
Input signal 
Output signal 
Output signal 


Output signal 


Input signal 
Output signal 





cpeare Power Connector and Pin Configuration 


The following shows the power connector pin 


configuration: 


Printed circuit board 






MEME A A LD i A 


Fig. 3.3 Power Connector in Configuration 


Table 3.1 Power Connector Pin Assignments 







ee 
ae 





a Gs 


S243 Connector Type 


The following connector type are recommended for 
the signal and power connections for the FDD; 


equivalent connector types may also be used. 


Socket: 
PS-34SEN-D4P1-1C-N 
(closed-end type) 
PS-34SEN-D4P1-1LD-N 
(daisy-chain type) 
bocthe by Japan Aeronotic 
Electronics Industry, 
Co., Led. 


Cable: 
3365-34 by 
Sumitomo-3M, Co., Lrd. 
or equivalent 


y 








‘NWA 


LE 


=v : il 
Power } 


cable 


Housing: 171822-4 


Pins: 170262-1 by Japan AMP, Co., Ltd. 


Fig. 3.4 Connector Locations and Recommended Models 


ces ie” 


Electrical Specifications 


Signal Level 


All the input/output signals are at TTL level with 


the following electrical specifications: 


TRUE 


Logical "Q" (LOW level) 0, to +0.4 V 


FALSE Logical "1" (HIGH level) +2.5 to +5.25 V 


Driver/Receiver 


The driver which outputs signals from PDD to the 
controller is an open collector output circuit 
Capable of obtaining sink current of maximum 40 mA 
at LOW level. THe receiver which receives signals 
from the controller to FDD is a Schmitt trigger 


gate terminating with 1k. 


ee Ne: ae 


FDD 


Controller +5V 
7438 or | 
equivalent 1KQ 
| TT au yo 
Driver Lois 
+5V 
7438 or 
TTL 1KQ equivalent 
samen“ aememmmammes mae, 
Receiver > 
Driver 


Fig. 3.5 Driver/Receiver Circuit Example 


Input Signals 
DRIVE SELECT 0 to 3 (DSO to 3) 


DRIVE SELECT 0 to 3 are signals for selecting a 
specified FDD. Setting one of DSO to DS3 to LOW 
level selects the corresponding FDD, which makes 


effective the input/output lines. 


FDD is specified by shorting one of the DX 


selection plugs 0 to 3 on the PWB. 


_ HEAD LOAD (HDL) (Option Signal) 


When FDD is ready (see Section 3.5.3), setting this 


signal to LOW level causes the magnetic head to 
touch the disk surface. However, in this device, 
it is common to make the magnetic head touch the 


media surface by motor on signal. 


STEP (STP) 


-Pulse signal which moves the magnetic head in the 
direction specified by the direction select 
signal. The head begins moving at the rising from 
LOW to HIGH level of this signal. The magnetic 
head moves over as many cylinders as the number of 
input pulses. Figure 3.6 shows the pulse timing 


conditions. 


T1: 3 ms min. 


T2: O.8 Usv2 ms 


Fig. 3.6 STEP Pulse Specification 


DIRECTION SELECT (DIR) 


Signal instructing the direction of magnetic head 
movement. The HIGH level indicates the direction 
toward the outer tracks and the Low level indicates 


toward the inner tracks. 


This signal must be Switched definitely 0.8 us 
before the trailing edge (positive going) of the 


STEP signal. 


SIDE SELECT (SSL) 


Signal selecting one of the heads used for write or 
read. The HIGH level selects the magnetic head on 
the side "0" of the disk and the Lov level selects 


the side "1", 


This signal must be switched 1004s before start of 


the read/ write operation. 


- 21- 


WRITE GATE (WGT) 


This signal writes data when at LOW level and reads 
data when at HIGH level. Do not turn off the HEAD 
LOAD sAgael Switch the SIDE SELECT signal, Or 
Start positioning, for lms after this Signal has 


gone to HIGH level. 


WRITE DATA (WDT) 


Pulse signal that supplies data to be written to 
the disk. Every time the signal changes from HIGH 
to LOW level, the write current in the magnetic 
head changes direction, which changes the direction 


of magnetization on the disk. 


Figure 3.7 shows the WRITE DATA specification. 


-~ 22 + 


T2 


WDT 
(FM) 
ot 
Ti: 4 Us (2T,: 8 wst25 ns) 
T: QO.15%2.5 us 
Ta 
WDT 
(MEM) 
- Ty 1.5T; 2T, 
T,: 4 us (2T,: 8 ys#25 ns) 


To: 0.15%2.5 us 


Fig. 3.7 WRITE DATA Pulse Specification 


MOTOR ON (MON) 


Setting this signal to LOW turns the spindle motor. 


Setting this signal to LOW makes the magnetic head 


touch the disk. 


Output Signals 


INDEX (IDX) 


Signal for indicating the origin on the disk. This 


is output once every revolution. Figure 3.8 shows 


the output pulse specification. 


The reading edge of the pulse is used as a 


reference. 


INDEX pe as 


(IDX) 


20023 ms 





Fig. 3.8 INDEX Pulse Specification 


TRACK 00 (TKO) 


When at LOW level, this signal indicates that the 


heads are on track "00". 


This signal is generated by the signal from the 
track 00 sensor and the (excitation) phase of the 


step motor. 


3.5.3 READY (RDY) 


Signal indicating that FDD is ready to operate. 
This signal goes to LOW level, when the FDD is 


selected, if the following conditions are satisfied: 
(i) DC power is supplied. 
(ii) A disk is mounted. 
(iii) The rotational speed of the floppy disk has 
reached 90% of the specification. 
3.5.4 READ DATA (RDT) 


Data read from a disk which is shaped into a pulse 


string. 


Figure 3.9 shows the READ DATA signal obtained when 


normally recorded information is read. 








READ DATA (RDT) 
(FM) 


| | lus (TYP) 





Fig. 3.9 READ DATA Signal Specification 


as I 


WRITE PROTECT (PRT) 


If a disk with its WRITE PROTECT hole uncovered is 
inserted into the drive, the PRT line goes low, 


which places the FDD in the WRITE PROTECT state. 


3.6 Interface Signal Timing 


3.6.1 Step and Track 00 > 


Step (STP) 


Track 00 (TKO) 


2.5 ms (max.) 


3.6.2 Access Timing 


l ms (min.) 


a 
Write Gate (WGT) aac 0.8 us¥2 ms 


“Step (STP) 











3 ms 18 ea 
(NOTE } 
Direction Select 0.8 us 


(DIR) (min.) 


(NOTE) An interval of at least 18 ms is required between 
step pulses when the direction changes. 


=. O97 x6 


3.6.3 Write Timing 


| 1 ms (min.) 


18 ms (min.) a 


Step (STP) 


Side select (SSL) Cis i 


100 us (min.) 


Write gate (WGT) 


3.6.4 Read Timing 


18 ms (min.) 


STEP (STP) 


100 us (min. ) 


SIDE SELECT (SSL) 


WRITE GATE (WGT) 





Valid read data 


3.6.5 Write Data Timing 


WRITE GATE (WGT) oe ee 
WRITE DATA (WDT) LPL LAL 


42656 DRIVE SELECT and Output Signal Timing 


The drive control and status signals are become 
valid 500 mS after that the DRIVE SELECT line is 


selected. 


Only the MOTOR ON signal is independent of the 


DRIVE SELECT signal. 


Sa7 Power Interface 
Seok Input Power Specifications 
Table 3.2 lists the DC power specifications for FDD. 


A sequence. for each DC power is not needed. 


Table 3.2 Input Power Specifications 


Ripple voltage (NOTE 1)|200 mVp-p or less |100 mVp-p or less 



















NOTE 1: This includes the spike voltage. 


OPERATING PROCEDURES 

The basic operating procedures for FDD include the 

power on/off, disk setting and removal. 

Setting A Floppy Disk 

(1) Turn on DC power. 

(2) Insert the diskette slowly into the slot until 
the Eject button pops out. 

Removing the Floppy Disk 


(1) Make Sure the write/read operation of FDD has 


finished. 

(2) To eject the diskette from the drive, just 
press the Eject button. 

Display Lamp 


The Display lamp indicates the FDD status. It 


comes on while heads are loaded. 


bt SBT es 


5. EXTERNAL SHAPE AND INSTALLATION 
Sed: External Shape and Fitting Hole Positions 


Figure 5.1 shows the external shape and fitting 


hole positions. 





NOTE 1: The faston terminal and cable are excluded 


from the size 128*1. 
Fig. 5.1 External Shape and Fitting Hole Positions 


a ae 


Installation 
FDD may be installed in the Poltowtng manners: 
(a) Vertical 
(b) Vertical 


-(c) Horizontal 


(a) (b) (c) 


Consider the location of FDD in the system, so that 
it may be protected against the noise from CRT, 
power supply, etc., especially when installing it 


inside CRT. 


ae i 


Sed Recommended Air Flow 


(1) Installing one FDD 


Ventilator 


jo) 
= 


10 





(2) Installing two FDDs 


Ventilator 





NOTE: Appropriate cooling is required if the 
ambient temperature around FDD rises 


considerably. 


- 34 - 


PACKING AND TRANSPORTATION 


(1) For external packing, either use the packing 
material used in the carrying in of FDD of 
make sure no direct shock will be transmitted 


to FDD. 


(2) Insert for packing the protective sheet used 


in the carrying in. 


(3) Make sure that FDD will sustain no excessive 


shock during transportation.