Hard Drive: MICROPOLIS: 1908-15 1381MB 5.25"/FH SCSI2 SE
1 9 0 8 - 1 5 MICROPOLIS
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 5.25"/FH Cylinders 2100| | |
Capacity form/unform 1381/ 1600 MB Heads 15| | |
Seek time / track 10.0/ 2.0 ms Sector/track | | |
Controller SCSI2 SINGLE-ENDED Precompensation
Cache/Buffer 256 KB READ-AHEAD Landing Zone
Data transfer rate 5.000 MB/S int Bytes/Sector 512
10.000 MB/S ext SYNC
Recording method RLL operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 10 50 | -40 65
Power: sleep W Humidity % 10 90 | 10 90
standby 25.0 W Altitude km -0.061 3.048| -0.305 15.240
idle W Shock g 3 | 40
seek 30.0 W Rotation RPM 5400
read/write W Acoustic dBA 40
spin-up W ECC Bit 64
MTBF h 150000
Warranty Month 60
Lift/Lock/Park YES Certificates
Layout
MICROPL. 1908S/D PRODUCT DESCRIPTION 105707 REV. A
Single-Ended +---------------------------------------------------------++-+ | ||X20 | COMPONENT SIDE ||X| | ||X|J2 | ||X| ++ |1-2 || ++W12 |XX || ++ |XX || +-+ |XX || | |RN6 |XX J1 || | | |XX || | | |XX || +-+ |XX ++ W2--W1 |XX | +---+ |XX | | 1 | ++W11 |XX J3 | ++++++ |XX Power +--------------------------------------+--+---------------+ 1
Differential
+---------------------------------------------------------++-+
| ||X20
| COMPONENT SIDE ||X|
| +-RN12 ||X|J2
| | | ||X|
++ | | |1-2
|| +-+ |XX
|| W2--W1 |XX
|| +---+ |XX J1
|| +-W10 |XX
|| +-+ |XX
|| +-RN11 |XX
|| | | |XX
++ | | |XX
| +-+ |XX
| | 1
| ++W11 |XX J3
| ++++++ |XX Power
+--------------------------------------+--+---------------+ 1
+---------------------------------------+
| ++J4 HDA Ground Connector |
| ++ |
| ++J5 Frame Ground Connector |
| ++ |
| |
| J2 1 J1 1 J3 1|
+...........-XXXXXXXXXXXXXXXXXX-XXXXXXXX+
+-+-+++-++++---Signal------------Power--+
| ||| ||||
| ||| |||+--- SCSI ID0 Pins 1 & 2
| ||| ||+---- SCSI ID1 Pins 3 & 4
| ||| |+----- SCSI ID2 Pins 5 & 6
| ||| +------ Spindle Control Option Pins 7 & 8
| ||+-------- Write Protect Option Pins 11 & 12
| |+--------- Bus Parity Check Option Pins 13 & 14
| +---------- Master Sync Pin 16
+------------ Slave Sync Pin 20
Jumpers
MICROPL. 1908S/D PRODUCT DESCRIPTION 105707 REV. A
Jumper Setting
==============
x = Factory default configuration
Differential Board
------------------
While the option jumpers may be positioned at locations different
from the single-ended version of the Device Electronic board, the
options supported are the same.
Interface Terminator
--------------------
Interface Terminator pack RN6 (RN11/RN12) provides proper termination
for the interface lines. For a multiple-drive system, the terminator
pack is installed in the last drive on the cable.
J2 Multi-Function Connector
----------------------------
Write Protect Option-----+ +---------Spindle Control Option
| | +------ID2
Bus Parity Check Option--+ | | | +---ID1
| | | | | ID0
+--+--+--+--+--++-++-+--++-++-++-+-++ +---
| | |20| |16|14|12| |08|06|04|02+-+ J1
| | | | | |13|11| |07|05|03|01+-+
+--+--++-+--++-+--+--+--+--+--+--+--+ +--
Slave Sync-+ Master
Sync
J2 SCSI ID ----------- +----------+-----------------------+ | SCSI ID | Jumpers | | | ID2 | ID1 | ID0 | +----------+-------+-------+-------+ |x 0 | OPEN | OPEN | OPEN | | 1 | OPEN | OPEN | CLOSED| | 2 | OPEN | CLOSED| OPEN | | 3 | OPEN | CLOSED| CLOSED| | 4 | CLOSED| OPEN | OPEN | | 5 | CLOSED| OPEN | CLOSED| | 6 | CLOSED| CLOSED| OPEN | | 7 | CLOSED| CLOSED| CLOSED| +----------+-------+-------+-------+
Up to eight devices (the host and seven targets) can be attached to
the SCSI bus. The 1908 drive has three ID jumpers. These three
jumpers are used to assign one of the eigth SCSI ID bits (0 through
7) to the drive.
In multiple-device systems, each drive must have its own unique ID
bit.
J2 Spindle Control Option
--------------------------
Pin 7-8 CLOSED The drive must wait for an interface START UNIT
command to start the spindle motor.
x OPEN The drive automatically starts the spindle motor
at power-on.
J2 Write Protect Option
------------------------
Pin 11-12 CLOSED The drive is write protected.
CAUTION: The drive can still be formatted.
x OPEN The drive is not write protected. (Factory
default configuration)
J2 Bus Parity Check Option
---------------------------
Pin 13-14 CLOSED The drive neither generates nor detects parity.
x OPEN The drive generates parity and enables parity
detection.
J4/J5 Ground Connectors
------------------------
3/16-inch spade lugs J4 and J5 are provided for grounding.
System characteristics determine proper ground connection.
W1/W2/W12 Bus Termination Power Option
---------------------------------------
+-----------------------+------------------------------------+ | Jumpers | | | W1 | W2 | W12 | | +-------+-------+-------+------------------------------------+ | CLOSED| OPEN | OPEN |The drive provides terminator power | | | | |to its on-board terminators | | | | |(Factory default configuration) | +-------+-------+-------+------------------------------------+ | OPEN | CLOSED| OPEN |Terminator power is provided by the | | | | |host via interface cable J1, pin 26 | +-------+-------+-------+------------------------------------+ | OPEN | CLOSED| CLOSED|The drive provides terminator power | | | | |to its on-board terminators and | | | | |also to the SCSI bus via interface | | | | |cable J1, pin 26 (TERMPWR) | +-------+-------+-------+------------------------------------+
A jumper is installed at W1, at W2, or at W2 and W12 to select the source of terminator power (+5V) for the SCSI bus terminator packs on the Device Electronics board.
Do not install jumpers at both W1 and W12.
Spindle Synchronization Option
-------------------------------
The Rotational Position Locking field (MODE SELECT command, Page Code
04h) is used to specify spindle synchronization operation.
Unsynchronized: If the drive is set to Unsynchronized (RPL = 00b), it
ignores the SLAVE SYNC signal.
Slave: If the drive is set to Slave (RPL = 01b), it does not generate
the MASTER SYNC signal or the SLAVE SYNC signal but synchronizes its
index to the SLAVE SYNC signal (J2, pin 20) supplied by an external
source.
Master: If the drive is set to Master (RPL = 10b), it generates the
SLAVE SYNC output signal (J2, pin 20) for use directly by the slave
drives.
Master Control: If the drive is set to Master Control (RPL = 11b), it
generates the MASTER SYNC signal (J2, pin 16). This output is used by
the controller to generate the SLAVE SYNC signal (J2, pin 20) for the
slaves.
W11 Frame Ground Option
------------------------
W11 CLOSED Frame ground is connected to logic ground
x OPEN Frame ground is not connected to logic ground
J3 DC Power and pin connector assignments ------------------------------------------- -------------------+ --+ +-----J3-----+| pin 1 +12 VDC 1| | 4 3 2 1 || pin 2 +12 Volts Return -+ +------------+| pin 3 + 5 Volts Return ------------------+ pin 4 + 5 VDC
Install
MICROPL. 1908S/D PRODUCT DESCRIPTION 105707 REV. A
Notes on installation
=====================
Drive mounting
--------------
horizontally vertically
+-----------------+ +--+ +--+ +------------------+
| | | +-----+ +-----+ | | | x
| | | | | | | | x+----------------+x
+-+-----------------+-+ | | | | | | ||x x||
+---------------------+ | | | | | | || x x ||
| | | | | | || x x ||
x x | | | | | | || x x ||
+------x------x-------+ | +-----+ +-----+ | || xx ||
+-+------x--x-------+-+ +--+ +--+ || x x ||
| xx | || x x ||
| x x | || x x ||
+---x--------x----+ |x x|
x x x++----------------++x
Dimensions and Mounting
-----------------------
The 1908 drive uses industry-standard mounting techniques for 5 -inch
full-height Winchester disk drives.
Recommended orientation is vertical on either side, or horizontal
with the Device Electronics board down; other mounting orientations
may be used provided the ambient air temperature around the drive is
kept at or below 50*C (122*F).
The term "ambient" becomes imprecise when referencing a drive in a
system, since it is difficult to determine where the air temperature
should be measured. To help resolve this confusion, Micropolis
specifies that the maximum HDA casting temperature (regardless of the
air temperature around the drive) is 60*C (140*F). Not exceeding this
temperature will ensure that the head-to-media interface never exceed
its temperature limit.
Mounting Screws
---------------
2 per side 6-32 UNC-2B
4 on bottom 6-32 UNC-2B
Caution: The mounting screws must be selected so that they do not
penetrate the bottom mounting holes by more than 0.20 inches or the
side mounting holes by more than 0.156 inches. Screws that are too
long will short to PCBA components and/or prevent operation of the
shock mount system.
SINGLE-ENDED Interface Electrical Characteristics
-------------------------------------------------
Interface control and status signals are digital (open collector TTL)
using industry-standard transmitters and receivers which provide
a terminated, single-ended system.
The assigned signals are terminated with 220 ohms to +5V (nominal) and 330 ohms to ground at each end of the cable. All signals use open-collector or three-state drivers.
Single-ended drivers and receivers allow a maximum cable length of
six meters (primarily for connection within a cabinet).
Signal transmission requires a single 50-conductor cable. A
characteristic impedance of 100 ( 10%) ohms is recommended for un-
shielded flat or twisted pair ribbon cable.
a. Input Characteristics
Each of the drive's signal receivers has the following
characteristics when measured at the interface connector.
1) Signal true = 0.0 VDC to 0.8 VDC
2) Maximum total input load = -0.4 milliamps at 0.5 VDC
3) Signal false = 2.0 VDC to 5.25 VDC
4) Minimum input hysteresis = 0.2 VDC
b. Output Characteristics
Each driven signal has the following characteristics when
measured at the interface connector.
1) Signal assertion = 0.0 VDC to 0.5 VDC
2) Minimum driver output capability = 48 milliamps (sinking) at
0.5 VDC.
3) Signal negation = 2.5 VDC to 5.25 VDC
c. Terminator Power (TERMPWR at Pin 26)
Terminator Power has the following requirements:
V(TERM) = 4.25 VDC to 5.25 VDC
800 milliamps minimum source drive capability, with 1.0 amp
recommended current limiting (e.g., a fuse).
1.0-milliamp maximum bus loading (except for the purposes of
providing power to an internal terminator).
The 1908 disk drive provides keyed connectors to prevent accidental
grounding or misconnection or terminator power.
Interface Terminator pack RN6 provides proper termination for the
single-ended interface lines. For a multiple-drive system, the
terminator pack is installed in the last drive on the cable.
DIFFERENTIAL Interface Electrical Characteristics ------------------------------------------------- Differential interface signals consist of two signal lines which are denoted +SIGNAL and -SIGNAL.
A signal is defined as true when the +SIGNAL is more positive than the -SIGNAL. A signal is defined as false when the -SIGNAL is more positive than the +SIGNAL.
Differential drivers and receivers allow a maximum cable length of
25 meters.
Signal transmission requires a single 50-conductor cable.
A characteristic impedance of 100 ( 10%) ohms is recommended for un-
shielded flat or twisted pair ribbon cable.
A minimum conductor size of 28 AWG should be employed to minimize
noise effects and ensure proper distribution of optional terminator
power.
A stub length of no more than 0.2 meters is allowed off the main-line
interconnection within any connected equipment.
a. Input Characteristics
Each of the drive's signal receivers has the following
characteristics when measured at the interface connector.
I (input current on either input) = 2.0 milliamps, maximum
Note: These characteristics include both receivers and passive
drivers.
This requirement is met with the input voltage varying between
-7V and +12V, with power either on or off, and with hysteresis
equaling 35 millivolts, minimum.
b. Output Characteristics
Each driven signal has the following characteristics when
measured at the interface connector.
VOL (low-level output voltage) = 1.7V maximum at IOL
where IOL = 55 milliamps
VOH (high-level output voltage) = 2.7V maximum at IOH
where IOH = -55 milliamps
VOD (differential voltage) = 1.0V minimum, with common-mode
voltage ranges from -7 to +12
VOL and VOH are measured between the output terminal and the
SCSI device's logic ground reference.
c. Terminator Power (TERMPWR at Pins 25 and 26)
Terminator Power has the following requirements:
V(TERM) = 4.0 VDC to 5.25 VDC
600 milliamps minimum source drive capability, with 1.0 amp
recommended current limiting (e.g., a fuse).
1.0-milliamp maximum bus loading (except for the purposes of
providing power to an internal terminator).
The 1908D drive provides keyed connectors to prevent accidental
grounding or misconnection of terminator power.
Interface Terminator packs RN11 and RN12 provide proper termination
for the differential interface lines.
Signal Connector J1
-------------------
J1 is a 50-pin connector. Signal interface connection is made via
this connector. The signals on J1 include the 8-bit SCSI bus and
various control and handshaking lines.
Recommended Cable: 3M Scotchflex 3365/50 or equivalent.
Mating connector: 3M P/N 3425-3000 or equivalent.
J2 Multi-Function Connector/Jumper Block
----------------------------------------
J2 is a 24-pin, multi-function connector/jumper block.
J3 DC Power Connector ---------------------- J3 is a 4-pin, keyed, AMP MATE-N-LOCK connector. Both +5V and +12V are supplied to the drive via this connector.
Mating Connector: AMP 1-480424-0 or equivalent
Pins: AMP 350078-4
Suggested Wire Size: 18 AWG
Ground Connectors J4 and J5
---------------------------
3/16-inch spade lugs J4 and J5 are provided for grounding. Systems
characteristics determine proper ground connection.
Mating connector: AMP 60972-2 or equivalent.
Multiple-Drive Systems
----------------------
Up to seven 1908 drives can be connected to a single host.
Drive #1
+------HOST------+ +-----------------+
| +-----------+ +--+-SCSI-BUS-----+ J1 |
| |Terminators| | | +------+ J3 J4/J5 |
| +-----------+ | | | +--------+--------+
| | | | +------------------+
+----------------+ | | Drive #2 |
| | +-----------------+ |
+-------+------+ J1 | |
| o------+ J3 J4/J5 | |
| | +--------+--------+ |
| | +------------------+
| | Drive #3 |
| | +-----------------+ |
+-------+------+ J1 | |
| o------+ J3 J4/J5 | |
| | +--------+--------+ |
| | +------------------+
| | Drive #4 |
| | +--------------+--+ |
+-------+------+ J1 |T | |
o------+ J3 J4/J5 +--+ |
--DC-Voltages------+ +--------+--------+ |
---GROUND--------------------------+------------------+
T = TERMINATORS
Terminators are installed ONLY in the last physical drive in the
control chain.
Connectors J4 and J5 are provided for grounding; system character-
istics determine the proper ground connection.
Adjustments and Maintenance
---------------------------
1908 drives requires no adjustments or periodic maintenance;
additionally, no mechanical adjustments are required to prepare a
system for handling or shipment.
Field-Replacable Components
---------------------------
The concept of repair by replacement of complete functional
components is utilized in the 1908, resulting in an MTTR of less
than 15 minutes.
Features
MICROPL. 1908S/D PRODUCT DESCRIPTION 105707 REV. A
Micropolis 1908S (single-ended) and 1908D (differential) high-
performance, 5 -inch full-height Rigid Disk Drives provide OEMs with
random-access, high-speed data storage and meet the needs of diverse
applications environment. These drivers are compatible with the
"ANSI CCS" and "SCSI-2" versions of the industry-standard Small
Computer System Interface (SCSI) specification.
Media Defects
-------------
Media defects are physical characteristics of the media which result
in repetitive read errors when a functional drive is operated within
specified operating conditions.
At the time of manufacture, a media test system evaluates every
drive and identifies each media defect location. The defective
areas are identified by head address (HD), cylinder address (CYL),
and number of bytes from Index (BFI). A printed listing of the
defects is also shipped with each drive.
The list of manufacturer-found defects is stored on the drive in a
reserved, write-protected area accessible by the SCSI controller.
This list is known as the MDL (Manufacturers Defect List) or PList
(Primary Defect List).
The entries it contains can be mapped out (reassigned) automatically
during the operation by appropriate use of the format control para-
meter bits.
Seek Time
---------
| 1908 |
----------------------------------+--------+
Track-to-Track read msec. typ. | 2 |
write msec. typ. | 3 |
Average msec. typ. | 11,5 |
msec. max. | 25 |
One-Third Stroke msec. max. | 12.5 |
Latency msec. avg. | 5.56 |
----------------------------------+--------+
Air Filtration System
---------------------
The 1908 drives are designed to provide contamination control within
the sealed HDA throughout the life of the drive with zero
maintainance.
Air within the HDA is continously and recirculated and filtered
through a high efficiency filter. Air is ducted to and from the
filter for maximum pressure recovery and filter efficiency. Air with-
in the HDA may only enter the drive through a high-efficiency
breather filter.
Data Transfers
--------------
1908 drives are capable of transferring data up to 10 MBytes/sec in
synchronous mode and 4 MBytes/sec in asynchronous mode. In some
configurations (e.g., short cable and fast host), faster asynchronous
transfer rates can be achieved.
Internal Transfer Rate 30 to 40 MHz.
Multi-Segment Read-Ahead
------------------------
The Multi-Segment Read-Ahead function partitions the data buffer
into multiple small buffers or segments. The read-ahead function
causes the 1908 drive to transfer the requested block into its buffer
and continue to read sequential blocks until the buffer (or segment)
is filled or another command is received.
On subsequented request for data, the buffer will be checked for the
requested blocks. If the data already resides in the buffer, it will
be transferred to the host and no media access will be necessary.
This results in a significant improvement in performance.
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