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BASF Aktiengesellschaft
B A S F 6 1 8 8
F i x e d D i s k D r i v e
S l i m - l i n e
S P E C I F I C A T I O N
Mannheim, March 1984 Spec.Nr. 8 0 3 0 7 - 0 6 0
VID/WM P a g e s : 30
Rev.: 0 3
BASF 6188 Product.Specification Page I
TABLE OF CONTENTS
1. Introduction
1.1 General Description
1.2 Specifications
1.2.1 Performance Specifications
1.2.2 Functional Specifications
1.2.3 Reliability Specifications
1.2.4 Physical Specifications
1.2.5 Environmental Specifications
1.2.5.1 Operating
1.2.5.2 Storage and Transport
2. Functional Characteristics
2.1 Basic Functional Units
2.1.1 Drive Mechanism
2.1.2 Housing
2.1.3 Positioning
2.1.4 Disks
2.1.5 Brake
2.1.6 Readmrite Heads
2.1.7 Control Electronics
2.1.8 ReadbJrite Electronics
2.2 Functional Operation
2.2.1 Spindle Motor Start
2.2.2 Drive Selection
2.2.3 Recalibrate/Restore
2.2.4 Seek
2.2.5 Head Selection
2.2.6 Write Operations
2.2.7 Read Operation
Page I1 BASF 6188 Product Specification
2.3 User Selectable Options
2.4 Fault-Codes
3. Drive Interface
3.1 Interface Signals
3.2 Electrical Requirements
3.2.1. Single Ended Signals
3.2.2 Differential Signals
3.2.3 Power Sequencing
3.3 Signal Definition
3.3-1 Control Input Signals
3.3.1.1 DR SEL 0-3
3.3.1.2 DIR IN
3.3.1.3 STEP
3.3.1.3.1 Ramp mode
3.3.1.3.2 Single step mode
3.3.1.4 HD SEL 0-2
3.3.1.5 WRT GATE
3.3.1.6 RED WRT CUR
3.3.1.7 OP CBL DET
3.3.2 Status Output Signals
3.3.2.1 DR SELTD
3.3.2.2 READY
3.3.2.3 TRACK O
3.3.2.4 SEEK COMPL
3.3.2.5 INDEX
3.3.2.5 WRT FLT
3.3.3 Data Signals
3.3.3.1 MFM WRT DATA
3.3.3.2 MFM RD DATA
BASF 6 1 3 8 P r o d u c t S p e c i E i c a t i o n Page I11
3.5 Physical Interface
3.5.1 I n t e r f a c e C o n n e c t o r J1, "Aw-Cable
3.5.2 I n t e r f a c e C o n n e c t o r 5 2 , "B"-Cable
3.5.3 Power C o n n e c t o r 5 3
3.5.4 Frame Ground C o n n e c t o r J 4
Page IV BASF 6188 Product Specification
LIST OF FIGURES
Option Switches
Error Indication
Control/Status Line Configuration
Data Line Configuration
Read/Wr ite Timing Requirements
MFM Write Data Timing
MFM Read Data Timing
Step Pulse Timing
Power Up Sequence
Recalibration Schemes
J1 Connector Dimensions
52 Connector Dimensions
J3 Connector
Drive Physical Dimensions
Mounting Recommendations
LIST OF TABLES
3-1 Jl/P2 Interface "Am-Cable Connector
3-2 J2/P2 Interface "B"-Cable Connector
BASF 6188 Product Specification Page 1
1. INTRODUCTION
1.1 GENERAL DESCRIPTION
The BASF 6188 stores the information on up to 2 non-removable
disks and up to 360 cylinders.
The BASF 6188 uses the industry standard interface and dimensions
to ease system integration. Up to four BASF 6188 may be connected
to one controller. For systems requiring removable media it is
recommended to use the BASF 6188 in combination with BASF Mini
Floppy Disk Drives which offer a capacity of up to 1 MByte.
The use of proven and highly reliable Winchester-Technology disks
and heads together with a closed-loop air filtering system
guarantees a maintenance-free operation throughout the drive's
lifetime and results in a MTBF of 11,000 working hours.
Reliability and low costs are the result of mechanical simplicity
and drive ruggedness, containing such features as a highly in-
creased lifetime of the steel band actuator, and a built in shock
absorber system.
Summary of main features:
- Storage capacity up to 15 megabytes unformatted
- Highly reliable Winchester-Technology
- Steel band actuator and fast access stepper motor
- Directly driven spindle with brushless DC-motor
- Integrated shock absorber system
- Spindle brake for reduction of stop time
- Industry standard interface and dimensions
- Microprocessor control
- Ramp mode
Page 2 BASF 6188 P r o d u c t S p e c i f i c a t i o n
1.2 SPECIFICATIONS
1.2.1 PERFORMANCE SPECIFICATIONS
Model BASF 6188
Disks
Cylinders
Capacity unformatted
P e r d r i v e (MBytes)
P e r s u r f a c e (MBytes)
Per track (KBytes)
Capacity formatted
P e r d r i v e (MBytes)
P e r s u r f a c e (MBytes)
Per track (KBytes)
Per s e c t o r (Bytes)
Sector per track
T r a n s f e r rate (MBits/sec) 5
Access T i m e s ( i n c l u d e s s e t t l i n g t i m e )
S i n g l e S t e p Mode B u f f e r e d S t e p Mode
(Ramped )
Step Pulse R a t e 1 . 0 msec - 3 . 1 msec 10 us - 200 u s
Single track 1 5 msec 1 5 msec
Average * (360' c y l ) 135 m s 88 m s
(306 c y l ) 117 m s 78 m s
Maximum (360 c y l ) 374 m s 213 m s
(306 c y l ) 320 m s -18'6 m s
* (equals 1/3 f u l l - s t r o k e )
A v e r a g e l a t e n c y (msec) 8.3
Head s e t t l i n g t i m e (msec) 15
S t a r t - u p time ( s e c ) 24
S t o p t i m e (sec) 10
BASF 6188 Product Specification Page 3
1.2.2 FUNCTIONAL SPECIFICATIONS
Model BASF 6188
Rotational speed (rpm) 3600 +- 1%
Recording density (bpi) 8900
Flux density (fci) 8900
Track density (tpi) 406
Index (per rev.) 1
Encoding method MFM
1.2.3 RELIABILITY SPECIFICATIONS
Mean Time Between Failure (MTBF) 11,000 hours*
Mean Time To Repair (MTTR) 30 minutes
Preventive ~ainteiance (PM) none required
Gesigned Lifetime 5 years
Error rates
Soft read errors 1 per 10" bits read
Hard read errors 1 per 1012 bits read
Seek errors 1 per lo6 seeks
Note: * Power On time under typical usage
Disk Media Defects
Disk drives are allowed to have the following number of media
defects when leaving the factory:
BASF 6188 10 max. but not more than 5 per surface
Cylinder zero is delivered error free.
Page 4 BASF 6188 Product Specification
1.2.4 PHYSICAL SPECIFICATIONS
DC-Power requirements (measured at BASF 6188 DC power connector
53
Operating Mode +12V +- 10% +5V +- 5%
Start up 2.5 A 1 A
Positioning 1.4 A 0.9 A
Data Transfer or Wait 1.1 A 0.8 A
Noise 50 mV peak to peak max.*
Heat dissipation 17 Watts typ.
during data transfer or Wait
Mechanical dimensions
Height 40.64 mm (1.6 inches)
Width 146 mm (5.75 inches)
Depth ** 203 mm (8 inches)
Weight 1.4 kg (3.1 lbs)
Safety requirements: in accordance with UL
Notes: * No combination of ripple and noise shall exceed the
supply tolerances.
** Face plate not included
Mounting orientation:
The BASF 6188 may be operated only when the Face Plate is in a
vertical plane. The maximum deviation is an ang'le of 13 degrees.
From the remaining four possible orientations only three are
allowed for operation. These are with the Read-Write-Control PCB
either on the left or right side or at the bottom of the drive.
Operation with the Read-Write-Control PCB on the top of the drive
is not allowed.
BASF 6188 Product Specification Page 5
1.2.5 ENVIRONMENTAL SPECIFICATIONS
1.2.5.1 OPERATING
The BASF 6188 shall work as specified when operated under the
following environmental condi~~ions
:
Temperature 4 to 50 degr. C
Temperature gradient 15 degr/h mac.
Relative humidity 15 to 80% (no condensation)
Dew point temperature 25 degr. C
Atmospheric pressure 84 to 110 x ~ / m ~
(-300 m to 3000 m)
Vibration: 5 to 50 Hz: 0.075 mm peak displacement
50 to 500 Hz: 1.0 g accel. (all directions)
Shock: Impact shocks of up to 3 g acceleration and up to
11 msec duration at least 10 sec apart.
Purity of surrounding air: Normal office conditions
1.2.5.2 STORAGE AND TRANSPORT (without packaging)
The BASF 6188 shall not show any damages or defects when the
following conditions are met during shipment and storage.
Temperature -40 to +70 degr. C
Temperature gradient 20 degr/h
Relative humidity 5 to 95% (no condensation)
Altitude range -300 m to 14000 m
Single shock max. 50 g acceleration
Periodical shocks max. 5 g acceleration
During transportation and storage the heads should be positioned
at the innermost cylinder.
The drive has a unique feature which after power loss detection
moves the heads to the innermost tracks where they are locked
through the Stepper motor lock solenoid.
Page 6 BASF 6188 Product Specification
2. FUNCTIONAL CHARACTERISTICS
2.1 BASIC FUNCTIONAL UNITS
2-1.1 DRIVE MECHANISM
A "disk pack" consisting of a hub with 2 disks is mounted on a
spindle which is directly rotated at 3600 rpm by a brushless 12
VDC mogor. The motor current is commutated by Hall Sensors and
related control electronics. This circuit also generates the
Index pulse.
2.1.2 HOUSING
The sealed module consists of an aluminium molded chassis and
cover. A closed loop air filtering system inside constantly
cleans the air of particles which may be generated by head to
disk interaction. An absolute breather filter for pressure
equalization with the ambient air pressure protects against
environmental contamination.
2-1-3 POSITIONING
The carriage on which the read/write heads are mounted is driven
by a stepper motor via a capstan and a metal band. The carriage
itself is precision mounted and guided by ball bearings.
2.1.4 DISKS
The disks are "Winchester" type and have an outsid'e diameter of
130 mm and an inner hole diameter of 40 mm. They are coated with
a thin layer of magnetic oxide on an aluminium substrate and are
additionally lubricated for head wear protection during incontact
start and stop operation.
BASF 6188 Product Specification Page 7
-2.1.5 BRAKE
For further protection of heads and disks in applications where
the system is switched on and off very often a mechanical brake
is installed to reduce the stop time to 10 sec.
2.1.6 READ/WRITE HEADS
Heads are "Winchester" type with minor modifications for track
width and flying height adjustment with respect to a different
relative head to disk velocity.
2.1.7 CONTROL ELECTRONICS
Control and read/write electronics are packaged together on a
single printed circuit board while power electronics for both
Spindle and Stepper Motor are located on a separate small printed
circuit board.
The control electronics fulfills the following functions:
- Drive Selection (one out of four) and indication
- Permanent Spindle Motor speed check
- Index generation
- Stepper Motor Control including velocity ramp and hysteresis
elimination
- Track Zero detection
- DC voltage monitoring
- Automatic retrack to shipping position after power down
- Microprocessor control of interface lines
- Error detection and display on front
Page 8 BASF 6188 Product Specification
2.1.8 READ/WRITE ELECTRONICS
Besides the usual read and write function the Read/Write
electronics performs error detection such as write fault and
selection of multiple heads during reading and writing,
2.2 FUNCTIONAL OPERATION
2.2.1 SPINDLE MOTOR START
The spindle motor of the BASF 6188 may be started in two ways:
either by applying the DC-voltages to the drive or through the
interface DR SEL (Drive Select) signal. This feature allows
sequential start up in case several drives are connected to the
system in order to reduce start up current.
2.2.2 DRIVE SELECTION
Each drive is assigned an address by setting the corresponding
Drive Select switch on the drive. Drive selection is done by
activating the corresponding DR SEL (Drive Select) signal through
the control unit, The selected drive responds then to all input
signals and enables its output drivers. In addition the green
front panel LED will be activated.
Alternatively t5e drive may be permanently selected through an
option switch if only one drive is connected to the controller,
However, the green front panel light will only be on when one of
the Drive Select lines is activated.
2.2.3 Recalibrate / Restore
After Power On the drive's positioning system is recalibrated by
performing an automatic seek to Track Zero.
BASF 6188 Product Specification Page 9
SEEK
In order to reach data on a specific track the controller has to
position the heads to that track by providing or receiving the
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