Dynabyte 11MB User manual

WINCHESTER
TECHNICAL MANUAL
11 & 23MB VERSIONS
AVAILABLE IN 5500, 5600, 5615, 5700, 5011, 5013, & 5015
PRELIMINARY -- FEBRUARY, 1981
PIN 404168

1.
2.
3.
4.
5.
CO}'7ENTS
GENERAL
...............................................
FEATURES
..............................................
Compact Size
............................... .
.....
Inexpensive ••.••••••
High Reliability •••••••••••••••.•••••••••.••.
2.1
2.2
2.3
2.4
2.5
2.6
Preventive Maintenance ..••.....•.••••.••..•...•....
DC Pover Supply ................................... .
Physical Dimensions •••.•.••.•••••••••••.••...•
2.7
Vertical or Horizontal Installation ••••••••.•.
2.8 Lo~ Power Consu~ption
2.9 Lo~ Noise
2.10 Low Vibration
SPECIFICATIONS
3.1
3.2
3.3
~.4
3.5
3.6
Performance
Reliability
Error Rate
Positioning Time
Start and Stop Time .••.••..••
Environmental Conditions
. ....
STRUCTt'TRE .•••••••••••••••••••••.•.••••.•.••••••••.•• .o ••
4.1
4.2
External Size
Unit Structure
INSTALLATION
5.1
5.2
5.3
Locker Installation
Service Areas
Transportation
i
Page
1
1
1
1
1
1
2
2
2
2
2
2
3
3
4
5
6
6
6
8
8
8
13
13
14
15

6.
7.
8.
CABLE CONNECTION
.....................................
6.1
6.2
6.3
6.4
6.5
6.6
Unit Connectors
......................................
Cable ~onnector Specifications •••••••••••••••••••••••
Single Connection
....................................
Connecting Multiple Units •••••••••••••••••••••••.•.••
......................................
Driver/Receiver
DC grounding
.........................................
INTERFACE
7.1
7.2
7.3
Signal Lines
Input Signals
Output Signals
........................................
7.4 Timing Specifjcations
7.4.1 Seek timing
"J .4 •2 Read /lI .. ri,te data timing •••••••••••••.•••••••••••••
7.5 Formats •.•••••••.•••.
7.5.1 Track format
7.5.2 Read/Write timing
7.6 Connector Positions
..............................,.
.............................
7•7 Power Supply Input Connector •••••.••.••••••.••••••••••
POWER SUPPLY COh~ITIONS
8.1
8.2
8.3
8.4
8.5
8.6
Input Voltage and Permissible Input Voltage
Variation ............................................. .
Current Values ....................................
Power Consumption
Current Waveforms
Power
ON/OFF Sequence ...............................
Others •••••••••••••.•
................................
9.
10.
MAINTENANCE PARTS
Connection to a .
....................................... .
Controller
-1i-
Page
17
17
18
19
19
20
20
21
21
22
24
26
26
27
28
28
28
30
31
32
32
32
33
35
36
37
38

Figure 4.1
Figure 4.2
Figure
5.1
Figure
5.2
Figure
5.3
Figure
5.4
Figure
5.5.
Figure
6.1
Figure
6.2
Figure
6.3
Figure
6.4
Figure
6.5
Table 6.1
ILLUSTRATIONS
Structure ................................ .
Air Circulation ••••.•••••.••••••••••.•••••
Locker Installation •••••••••••••..•.••••••
Maintenance Sections ••••••••.••••••.•••.••
Fixing the Carriage •••••••••••••••••••••••
Fixing the Unit •••••••••••••••••••••••••••
Cable Holder •••••••••••••••••••••••••••••
Unit Connec tors •.••••••••••.•• 0 •••••••••••
Single Connection •••••••.••••••••..••...••
Connecting Multiple Units •••••••••••••••.•
Driver /Recei ver •••••••••••.•••••••.•.•••••
DC Grounding
TABLES
Cable Connector Specifications
Table 9.1 Maintenance Parts ••••••••••••••••..•••••••
APPENDICES
Appendix 1. Media Error ••••••••••.•••.••••.••••.•••••
Appendix 2. Switch Setting Procedures ••.•••. o •••••••••
-iii-
Page
9
10
13
14
15
15
16
17
19
19
20
20
18
37
1
3

1. GENERAL
The M2301A/M2302A ~ini·-disk drive unit is a compact (floppy size),
inexpensive, and highly reliable fixed disk drive developed for
random access use in small computers, word processors, and
terminals.
The storage capacities (unformatted) of the M2301A and M2302A are
11.1M bytes and 23.4M bytes, respectively.
2. FEATURES
2-1 Compact Size
Since the disks are 200mm in outer diameter and are driven by
a
DC motor directly connected to the spindle, the unit is
extremely compact in size:
8.5in. (width) x 4.4in. (height) x 14.0in. (depth)
2-2 Inexpensive
The stepping motor positioning mechanism uses a steel band
and
viscose damper. This simplifies the structure and lowers
the cost of the unit.
2-3 High Reliability .
Heads,
disks, and positioner (Winchester technology) are
hermetically sealed inside a plastic cover, and the air
inside the DE (disk enclosure) is kept clean by a
breather filter and recirculation filter. This increases
reliability by reducing the chance of a head crash.
2-4 Preventive maintenance is unnecessary.
-1-

2-5 DC Power Supply
The
integral DC spindle motor requires no adjustment for lj.ne
frequencies (50Hz/60Hz) or input power voltages (100, lIS,
220. 240V).
2-6 Physical Dimensions
Because
its physical size is the same as that of a floppy
disk drive, this unit can replace a floppy disk drive
without requiring a new locker.
2-7 Vertical or Horizontal Installation
The unit may be installed in its locker either vertically or
horizontally, whichever is optimal.
2-8 Low Power Consumption
The power consumption
is 60W when seeking and SOW when not
seeking. This low power consumption enables the unit to
be used in a very wide environmental temperature range
(50 to 45
0
C) without a cooling fan.
2-9 Low Noise
The unit's low noise output, less than '55' dB, (A-scaie
weighting)even during seeking makes it ideal for office use.
2-10 Low Vibration
The unit is attached to the locker through four vibration-
da~ping rubber mounts.
-2-

-,
3.
SPECIFICATIONS
3.1
Performance
Model
Spec .
Total storage ' Unformat
capacity
* Format
Storage capa-
Unformat
city/track
* Format
Number
of
platters
Number of heads (R/W)
(Clock)
Number of
cylinders
Number
of
tracks/cylinder
Number
of
sectors
Recording density
Track density
Transfer rate
Rotational speed
Average
rotational
Latency
Recording method
Positioning time
Input voltage
External size
Min
Ave
Max
width x height x depth
Disk size
Weight
[ME]
[liB]
[ B ]
[ B ]
:Li.==w:..-=::;::.~;."-
"'
=
Mini
-Disk Drive
M230l
M2302
:
11.71
23.42
9.99
19.98
12,000
10',240
",.
I
'"
4 I
1
244
4 !
I
Variable/Hard
6,100
BPI
195
TPI
593
KB/S
2,964
RPM
10.1
ms
MFM
30
ms
70
ms
140 ms
+24V±lO%, l.6A (MAX 6.0A)
+ 5V± 5%, 4.1A (MAX 6.0A)
- 5V± 5% .
or -7V"-16V' O.5A
8.5" x 4.4" x 14.0"
(217mm x 111mm x 356mm)
OD ~20Omm ID ~10Omm
14 Ibs : (6.3 kg)
4
8
8
* Format based on 40 sectors/track.
- 3 - .
-r=-"

3.2 Reliability
(1) MTBF
MIBF is defin~d as follows:
MIBF c operating time/number of malfunctions in the unit.
The operating time refers to time during which the power is
turned on (maintenance time is excluded). Malfunctions in
the unit refer to those that require repair, adjustment, or
replacement. Ualfunctions caused by operator errors, power
supply troubles, troubles in the controller or cables, and
other environment problems not related to the device itself
are excluded.
The MTBF of the M2301A/M2302A MDD is 10,000 hours (design
value) •
(2) MTTR
MTTR is the average time taken by a well-trained service
technician to diagnose and repair a unit malfunction. The
M2301A/M2302A is designed for an MTTR of 30 minutes or less.
(3) Service Life
Overhaul of M2301A/M2302A MDD is not required for five
years or 20,000 hours of operation.
(4) Power Loss
Integrity of the data on the disk is guaranteed against all
forms of abnormal DC power loss. (Data is not assured during
a ¥."I'ite operation):
- 4 -

3.3 Error Rate
Errors detected upon initialization and replaced by an alternate
record are not included in the error rate.
(1) Recoverable error rate
A recoverable error is one which can be read correctly within
one retry command and should not exceed one per 10
10
bits.
(2) Non-recoverable error rate
Errors that cannot be recovered wlthin 16 retries are inc1udec
in the MTBF.
(3) Positioning error rate
The rate of positioning errors recoverable by one retry is
one error ~~ less per 106 seeks.
(4) Media error
(a) No defects at HO and HI areas on cylinder 000 .
• ~ (b) The number of defective sectors in the M2301A/M2302A
(40-sector format) are as follows:
M230lA
M2302A
maximum 20
maximum 40
- 5

3.4 Positioning Time
(ms)
150
C1i
e
~
100
£-4
oc
s::
~
~
0
50
~
.....
~
C/j
0
~
100 200 240
(cyl)
Distance
3.5 Start and Stop Time
When the drive is powered down. dynamic braking is used to
minimize wear on disks and heads. Start time (time from when
power is turned on until unit is ready) and stop time ( time
to completely stop when power is turned off) are 20 seconds
or less each.
3.6 Environmental Conditions
Temperature
Relative
humidity
Vibration
Operating
Non-operating
Gradient
Operating
Non-operating
Operating
Non-operating
(polJer-off state
after installation)
During transporta-
tion and storage
- 6 -
41° to l13
0F
(SoC to 4SoC)
-40°F to 140°F (-40°C to 60°C)
lscC/H or less
20~' ,.~ 80~ RH
5~' '\, 95% RE
Moisture must not condense.
O.2G (3'V 60H2 t except
resonance condition~)
2min. x 3J cvcJ~~
0.4G (~60Hz)
2 min. x 30 cycles
(sinusoidal)
3G

Shock During
operation 2G
maximum
1 Oms
Non-operating time 3G
maximum lOms
During transporta-
tion and storage
5G
maximum 30ms
Altitude
During operation
10,000 ft
(3,000m)
or below
above sea
Non-operating time
40,000
ft
(12,00Om) or below
level
- 7 -

4. STRUCTURE
4.1 External Size
See Fig. 4.1.
4.2 Unit Structure
The mini- disk drive unit consists of disks, heads, DC motor,
carriage assembly, cover, recirculation filter, base, read switch
(PCB), and logics (PCB).
(1) Disk
Disks are 100mm in inner diameter and 200mm in outer diameter
and are coated with a special lubricating material (Winchester-
type). Durability is over 10,000 starts and stops.
The numbc~ of disks per unit is two in the M230lA and four in
the M2302A.
(2) Head
The Winchester-type heads are in contact with the disks when
the disks are not moving, but begin to fly when the
rotation reaches a certain speed.
The number of
the M2302A.
heads is four in the M230LA, and eight in
A similar head is used as the clock head, which.reads the
data written on the lower surface of the bottom disk to generate
~ndex, Sector, Write clock, Read clock and PLO clock signals.
(3) DC motor
The
disks are rotated by a direct-drive DC motor. This motor
.
attains a very precise rotational speed of 2964 rpm±2% because
the current is controlled by comparing the phases of the clock
- 8 -

Base
Carriage
asse:nbly
R/\\ head
~
-.0
.
N
+1
--.0
. .
+1
Lt"I
Lt"I
c:
M
Of"!
..;:t
-
i
-.0
.
0
+1
N
.
M
0
N
§
N·
LI"'I
o
·
+1
c:
.,..
co
·
Read switch(PCB)
Circ:ula tir:~
Filter
DC Hotor
Clock head Disk
Fig. 4.1
Structure
- 9 -

signal from the control circuit o~cillator and the clock
signal read by the clock bead.
(4) Carriage assembly
This assembly consists of a 4-phase stepping motor. band
actuator. viscose damper. and carriage with a linear bearing.
The carriage working with the special 4rive circuit. gives
increased reliability and a very short average access time
of 7Oms.
(5) Air circulation
Recirculation filter
Breather filter
Fig. 4.2 Air Circulation
As sho~~ in Fig. 4.2. the heads. disks and earr~age are,
sealed hermetically inside a plastic cover to shut out any
contamination. This head disk assembly has a closed-loop
air recirculation system by using the blower effect of the
rotating disks to continuously circulate air through the
recirculation filter.This filter eliminates any dust
generated inside the enclosure. To prevent dust intrusion
-10 -

due to pressure differences, a breather filter is attached at
the center of the disk where the pressure is lowest. This
breather filter equalizes the internal air pressure with
atmospheric pressure due to start up conditions and
temperature differences between the DE and its environment.
The filters used here are all absolute filters ~ith a dust
elimination rate of 99.97% for particles O.3}lm or larger.
(6) Read/Write Circuit
The read/write circuits are designed using special analog
LSIs developed for large disk drive units. Use of these
LSIs simplifies circuitry and increases data reliability.
A VFO circuit and modulation/demodulation circuit for
MFM data are incorporated to reduce the controller's
cost and facilitate controller design.
(7) Stepping Motor Drive Circuit
The speed of the stepping motor is controlled by a speed
up/slow down control circuit that uses a ROM. It generates
an optimal pulse train and shortens access time. The
stepping motor is driven by two power supplies, so it per-
forms fast access with low power consumption when not seeking.
When 255 or more step pulses and the FALSE direction signal
(outer direction) are issued, the unit assumes the Return-to-
Zero (RTZ) instruction and automatically seeks to track O.
(8) DC Motor Drive Circuit
Rotational speed is controlled by comparing the byte clock
recorded in the clock track and a crystal oscillator signal.
This circuit thus maintains constant rotational spe~d.
-11 -

(9) Index/sector circuit
Index/sector signals are obtained from the index information
in the clock track and the byte clock. The number of sec-
tors can be set at the required value using switches on the
printed-circuit board.
-12 -

5. INSTALLATION
5.1 Locker Installation
Fig. 5.1 shows the direction, method and frame structure of the
unit.at the locker installation.
...-4
.
+d
~
~
...-4
,
I
!
I
I~
1\0
~~
\0
.
I~
~
..
c:C""'\
~o
«>N
Carriag_
lock lever
c: N
~ 0
«> •
Q'\ +I
.i
~----------~-------~
c--- ...
I ~
4-M4xO.7 4
For trans-
porut1ofl !1.ax. O. 2in!. 02
lolt iencth:
aax111UIC e mm O. 14 in Horizontal
.3in 1nstallat1oa: botto.
4-Vibration-proof
rubber mounts(M4xO.7 slots)
\t length: maximum lOmm
\\\
I 63.S:
0•6
111 ~1.6
2.5in-:.02
Ver:ic~l 1nstallatior.:
bot to: (or tOJ))
In.tall_tioe frame
(.lIbo.led Itructure)
Hu. 3.Smm
0.14in
Fig. 5.1 Locker Installation
-13 - .

5.2 Service Areas
The areas used for maintenance. securing the unit for trans-
portation. and cable connection are the p. Q. and R planes
sh~n in Fig. 5.2. Ease of maintenance should be considered
when deciding the system service clearance and locker instal-
lation.
P plane:
Q plane:
R plane:
PCB maintenance
Cable connection
~
p
Electronics (PCB)
Bolt removal/instal!ation for transportation
Lever lock for fixing the carr-iage
Bolt removal/installation for transportation
Bad track label and unit serial number.
Fig. 5.2 Maintenance considerations
- 14 -.

5.3 Transportation
When the unit is to be transported inside its locker, the lock
lever must be set and fixed to LOCK to avoid damage by shock.
The procedure is as follcws:
(1) FixinS the carriage
Lock lever
The lock is fixed (LOCK) and
released (FREE) by pulling up
the lever and moving it in the
direction of the arrows.
Fig:. 5.3 shows the locked state.
Fig. 5.3 Fixing the carriage
(2) Fixing the unit
.141n.
.
M
Fig. 5.4
Use the slot for trans?ortation
and fix the unit on the installa-
tion frame.
Installation frame
Vibration-proof
rubber'spacer
Mounting Bolt (M4)
Elastic material such as
rubber or plastic
l6mm or les\;
4-bolts for transportation (M4)
0.631n.
Fixing the Unit
- 15 -

(3) Preventing connector disconnect
To prevent the connecting cables from disconnecting, they are
retained by a cable holder as shown in Fig. S.S.
The cable holder is fixed on the CNA and CNB surfaces by
screws.
--~--------------~--------------~---
I
I
I
I
CNA
PO~~R eN
Fig. 5.5 Cable Holder
-16 -