3.5" FLOPPY DISK DRIVE
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
Specifications remain subject to change to allow the
introduction of design improvements.
Printed in Japan
<a Prepared in March 1984
Prepared in July 1984
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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
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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) 22.214.171.124 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
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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
“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
ata transfer rate 125 k-bit/sec.
aximum bit density
Average rotational speed
Seek settling time
Head load time
Start time 0
Standard | Width
dimen- Height 101.6
(NOTE 1) | Depth
14 | Operating 4%~ 46
Relative 20 ~ 80
wet-bulb (no bedewing)
Voltage (Vv) Startup current) Steady-state
(NOTE 1) current (NOTE2)
Heat output keal/h
Reli- MTSF (NOTE 3) 12000 (Under standard
ability use condition)
Device life 15000 POH or 5 years
Retryable (Not including 2 Times/bit
or less retry attemps)
Unretryable 10>" Times/bit
Seek error Times/seek
Disk life Pass count/ an ox 10°
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
Maximum 45 °C
wet-bulb ae aie (113) (°F)
Largest 36 30 °C/h
ea (86) (86) (°F/h)
vibration (Less than (Less than (Less than
(Except at 100 Hz) 100HZ) 100 H2)
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
(2) Actual head load : 0.5h/day
time (R/W time)
(3) Head load count
(4) Disk insertion/ : 25 times/day
(5) Motor ON/OFF : 300 times/day
(6) Average use time : 2h/day
per disk (4 disks/day.drive)
The major component of FDD have the following
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.
Moves the carriage assembly via the steel band.
Head load assembly
Brings the magnetic head into contact with the
disk in read/write operations.
Optically senses the index point attached to
the spindle motor.
(7) Track 00 sensor
Optically senses that the magnetic head is at
(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.
Mounts the electric circuits that controls
positioning of magnetic head, read/write
(11) Disply lamp
A LED is provided for display of the FDD
(12) Front panel
Dress panel installed on the Drive front.
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
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
2.4 Disk Specifications
(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 Number of total tracks
Relative 8% 80%
Wet-bulb 29°C Maximum (84°F)
Temperature 20°C/h Maximum (36°F/h)
External 4000 A/m (50 oersted) or less ,
Standing Leave the disk at least 30
minutes in the device
perating environment before
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.
Fig. 2.1 Disk Structure
Se ee es
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
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(b) Daisy Chain attachment
Fig. 3.1 Basic Connection Modes
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.
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Fig. 3.2 Connector Locations
Scaes Signal Types and Pin Configuration
The following shows the signal connector pin
configuration on the FD1030:
PIN No. 2 PIN No. 34
Signal name I/O Pin Pin Signal name
. number | number
(HEAD LOAD/IN USE)
DRIVE .SELECT 3
DRIVE SELECT 0
DRIVE SELECT 1
DRIVE SELECT 2
cpeare Power Connector and Pin Configuration
The following shows the power connector pin
Printed circuit board
MEME A A LD i A
Fig. 3.3 Power Connector in Configuration
Table 3.1 Power Connector Pin Assignments
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.
bocthe by Japan Aeronotic
Sumitomo-3M, Co., Lrd.
=v : il
Pins: 170262-1 by Japan AMP, Co., Ltd.
Fig. 3.4 Connector Locations and Recommended Models
All the input/output signals are at TTL level with
the following electrical specifications:
Logical "Q" (LOW level) 0, to +0.4 V
FALSE Logical "1" (HIGH level) +2.5 to +5.25 V
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
7438 or |
| TT au yo
TTL 1KQ equivalent
samen“ aememmmammes mae,
Fig. 3.5 Driver/Receiver Circuit Example
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.
-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
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
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.
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 +
Ti: 4 Us (2T,: 8 wst25 ns)
T: QO.15%2.5 us
- 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.
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
INDEX pe as
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
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
Figure 3.9 shows the READ DATA signal obtained when
normally recorded information is read.
READ DATA (RDT)
| | lus (TYP)
Fig. 3.9 READ DATA Signal Specification
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 >
Track 00 (TKO)
2.5 ms (max.)
3.6.2 Access Timing
l ms (min.)
Write Gate (WGT) aac 0.8 us¥2 ms
3 ms 18 ea
Direction Select 0.8 us
(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
Side select (SSL) Cis i
100 us (min.)
Write gate (WGT)
3.6.4 Read Timing
18 ms (min.)
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
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.
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
(2) To eject the diskette from the drive, just
press the Eject button.
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
NOTE 1: The faston terminal and cable are excluded
from the size 128*1.
Fig. 5.1 External Shape and Fitting Hole Positions
FDD may be installed in the Poltowtng manners:
(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
Sed Recommended Air Flow
(1) Installing one FDD
(2) Installing two FDDs
NOTE: Appropriate cooling is required if the
ambient temperature around FDD rises
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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
(2) Insert for packing the protective sheet used
in the carrying in.
(3) Make sure that FDD will sustain no excessive
shock during transportation.