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Articles / TULARC / PC info / Hard Drives / MICROPOLIS Hard Drives / |  |
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Hard Drive: MICROPOLIS: 1528-15D 1346MB 5.25"/FH SCSI2 DIFF |
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1 5 2 8 - 1 5 D MICROPOLIS
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 5.25"/FH Cylinders 2100| | |
Capacity form/unform 1346/ 1535 MB Heads 15| | |
Seek time / track 14.5/ 4.0 ms Sector/track 84| | |
Controller SCSI2 DIFFERENTIAL Precompensation
Cache/Buffer 256 KB DUAL-PORTED Landing Zone
Data transfer rate 2.912 MB/S int Bytes/Sector 512
4.800 MB/S ext SYNC
Recording method RLL operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 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 2 | 20
seek 30.0 W Rotation RPM 3600
read/write W Acoustic dBA 43
spin-up W ECC Bit 48
MTBF h 150000
Warranty Month 60
Lift/Lock/Park YES Certificates
MICROPL. 1528 PRODUCT DESCRIPTION 105389 REV. A
Single-Ended +---------------------------------------------------------++-+ J2 | +-+W5 || | | +-+ || |ID 2 | +-+W4 || |ID 1 | +-+ |+-+ID 0 | COMPONENT SIDE +-+ |XX | | | |XX | RN9 | |XX J1 | | | |XX | | | |XX | +-+ |XX | +----+ |XX | +----+ |XX | W1 W2 |XX | +---+ |X1 | Frame Ground +---W11 | | Option ++W28 |XX Power | ++ |XX J3 +---------------------------------------------------------+ 1
Differential +---------------------------------------------------------++-+ J2 | +-+W5 || | | +-+ || |ID 2 | +-+W4 || |ID 1 | +-+ |+-+ID 0 | COMPONENT SIDE +-+ |XX | | | |XX | RN9 | |XX J1 | +-+ |XX | +----+ |XX | +----+ |XX | W1 W2 |XX | +-+ |XX | | | |XX | RN11 | |X1 | W11-++-+ | | ++W28 +-+ |XX Power | ++ |XX J3 +---------------------------------------------------------+ 1
+--------------------------------------+
| +--+J4 HDA Ground |
| +--+ |
| |
| +--+J5 Frame Ground |
| +--+ |
| J2 J1 J3 |
|.......... XXXXXXXXXXXXXXXXXX XXXXXXXX|
+Multi--+++----Signal--------1--Power-1+
ID210
MICROPL. 1528 PRODUCT DESCRIPTION 105389 REV. A
Jumper setting
==============
x = factory default configuration
Drive Option Selection
----------------------
While the option jumpers may be positioned at locations different
from the single-ended version of the Device Electronics board, the
options supported are the same.
If more than one drive is to be installed in a system, remove the
interface terminator at RN9 (RN11) from each drive except the last
one; and configure each drive to a different SCSI ID.
J2 Device Addressing --------------------- +----------+-----------------------+ | 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 (A host and seven targets) can be attached to
the SCSI bus. The 1528-15 disk drive has three ID jumpers which are
used to assign one of the eight SCSI ID bits (0 - 7) to the drive.
In multiple-device systems, each drive must have its own unique ID.
Interface Terminator pack RN9 (RN11) 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 Operator Panel Option
-------------------------
Multi-Function Connector/Jumper Block J2 is used to connect the
drive to a user-supplied operator panel.
J2 Pin 19 Logic ground
20 Not used
21 Write Protect Input. Logic Ground disables writing and
lights the Write Protect LED.
22 Ready output. Logic ground indicates that the drive is
Ready and lights the Ready LED.
23 +5V source for the LEDs.
J4/J5 Ground Connection
------------------------
3/16-inch spade lugs J4 and J5 are provided for grounding; system
characteristics determine proper ground connection.
W1/W2/W11 Bus Termination Power Option
---------------------------------------
+-----------------------+------------------------------------+ | Jumpers | | | W1 | W2 | W11 | | +-------+-------+-------+------------------------------------+ x| CLOSED| OPEN | OPEN |The drive provides terminator power | | | | |to its on-board terminators | +-------+-------+-------+------------------------------------+ | OPEN | CLOSED| OPEN |Terminator power is provided by the | | | | |host via interface cable J1, pin 26 | | | | |(TERMPWR) | +-------+-------+-------+------------------------------------+ | 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 W11 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 W11.
W4 Bus Parity Check Option
---------------------------
CLOSED The drive neither generates nor detects parity.
x OPEN The drive generates parity and enables parity detection.
W5 Spindle Control Option
---------------------------
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.
W28 Frame Ground Option
------------------------
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
MICROPL. 1528 PRODUCT DESCRIPTION 105389 REV. A
Notes on installation
=====================
Recomended 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 1528-15 drive uses industry-standard mounting 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.
Inasmuch as the drive frame acts as a heat sink to dissipate heat
from the unit, the enclosure and mounting structure should be
designed to allow natural convection of heat around the HDA and outer
frame. If the enclosure is small or natural convetion is limited,
a fan may be required.
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 proper operation of
the shock mount system.
Signal Connector J1
-------------------
J1 is a 50-pin connector on the Device Electronics board. 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
Multi-Function Connector J2
---------------------------
J2 is a 24-pin connector on the Device Electronics board and is used
for connecting the drive to a user-supplied Operator Panel.
DC Power Connector J3 --------------------- J3 is a 4-pin, keyed AMP MATE-N-LOK Connector on the Motor Control Board. Both +5V and +12V is supplied to the drive via this connector.
Mating Connector: AMP 1-480424-0
Pins: AMP 350078-4
Suggested Wire Size: 18 AWG
Ground Connectors J4/J5
-----------------------
3/16-inch spade lugs J4 and J5 are provided for grounding. System
characteristics determine the proper ground connection.
Mating Connector: AMP 60972-2 or equivalent.
Multiple-Drive Systems
----------------------
Up to seven 1528-15 drives can be connected to a single host.
Drive #1
+------HOST------+ +-----------------+
| +-----------+ +--o-SCSI-BUS-----+ J1 |
| |Terminators| | | +------+ J3 J4 |
| +-----------+ | | | +--------+--------+
| | | | +------------------+
+----------------+ | | Drive #2 |
| | +-----------------+ |
o-------+------+ J1 | |
| o------+ J3 J4 | |
| | +--------+--------+ |
| | +------------------o
| | Drive #3 |
| | +-----------------+ |
o-------+------+ J1 | |
| o------+ J3 J4 | |
| | +--------+--------+ |
| | +------------------o
| | Drive #4 |
| | +--------------+--+ |
+-------+------+ J1 |T | |
o------+ J3 J4 +--+ |
---DC-VOLTAGES-----+ +--------+--------+ |
---GROUND--------------------------o------------------+
T = TERMINATORS
Interface Terminators are installed ONLY in the last physical drive
in the control chain.
Connectors J4 and J5 are provided for grounding; system
characteristics determine the proper ground connection.
Interface Electrical Characteristics (Single-ended)
---------------------------------------------------
Interface control and status signals are digital (open collector TTL)
utilizing 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 signal driven by an SCSI device 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 1528-15 disk drive provides keyed connectors to prevent
accidental grounding or misconnection of terminator power.
Interface Electrical Characteristics (Differential) --------------------------------------------------- Differential drivers and receivers allow a maximum cable length of 25 meters. Differential interface signals consist of two signal lines 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.
- Signal transmission requires a single 50-conductor cable. - A characteristic impedance of 100 ( 10%) ohms is recommended for unshielded 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 drives signal receivers has the following
characteristics when measured at the interface connector.
I(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) = 1.7 V max at IOL
where IOL = 55 milliamps
VOH (high-level output voltage) = 2.7 V max at IOH
where IOH = -55 milliamps
VOD (differential voltage) = 1.0 V minimum, with commonmode
voltages 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 Pin 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 1528-15D disk drive provides keyed connectors to prevent
accidental grounding or misconnection of terminator power.
Adjustments and Maintenance
---------------------------
The 1528-15 disk drive requires no adjustments or periodic
maintenance. Additionally, no mechanical adjustments are required to
prepare the drives for handling or shipment.
Field-Replaceable Components
----------------------------
The concept of repair by replacement of complete functional
components is utilized in the 1525-15, resulting in an MTTR of
less than 15 minutes.
MICROPL. 1528 PRODUCT DESCRIPTION 105389 REV. A
1528-15 Specifications
----------------------
Micropolis 1528-15 (single-ended) and 1528-15D (differential) high-
performance, 5 -inch, full-heigth Rigid Disk Drives provide OEMs with
random-access, high-speed data storage and meet the needs of diverse
applications environments.
These drives are compatible with the "ANSI CCS" and "SCSI-2" versions
of the industry-standard Small Computer System Interface (SCSI)
specification.
Seek Time
---------
| 1528 |
----------------------------------+--------+
Track-to-Track msec. typ. | 4 |
Average msec. typ. | 14.5 |
Maximum msec. | 32.25 |
One-Third Stroke msec. max. | 15.5 |
Latency msec. avg. | 8.33 |
----------------------------------+--------+
Formatted Capacity Calculation
------------------------------
The formatted capacity of the 1528-15 disk drive depends upon a
a number of userselectable variables. One critical variable is
sparing, either track-oriented or cylinder-oriented.
The following formula is used to calculate the formatted capacity (C)
of the 1528-15 drive using cylinder-oriented sparing:
C = [(SPT x HDS) - (SPARE_SPC)] x (2106 - 3 - SPARE_CYL) x (BYTES)
where SPT is the number of physical sectors per track.
HDS is the number of data heads.
SPARE_SPC is the number of spare sectors per cylinder. This variable
is user programmable. A typical value for the 1528-15 drive is 8.
2106 is the number of physical cylinders.
3 cylinders are used by the drive and are not user accessible.
SPARE_CYL is the number of spare cylinders. This variable is user
programmable; a typical value for sparing is 3.
BYTES is the bytes per sector (e.g., 1024, 512, etc.)
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 defects are logged on
a label affixed to the drive.
The defective areas are identified by Head address (HD), Cylinder
address (CYL), and number of Bytes from Index (BFI). A printed list
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 is contains can be mapped out (reassigned) automatically
during the operation by appropriate use of the format control
parameter bit.
+------------------------------------------------------------+
| Micropolis specifies that all 1528-15 drives shall have no |
| more than one defect per megabyte of unformatted capacity. |
+------------------------------------------------------------+
Adjustments and Maintenance
---------------------------
The 1528-15 disk drive requires no adjustments or periodic mainten-
ance; aditionally, no mechanical adjustments are required to prepare
a system for handling or shipment.
Field-Repalceable Components
----------------------------
The concept of repair by replacement of complete functional
components is utilized in the 1528-15, resulting in an MTTR of less
than 15 minutes.
Air Filtration System
---------------------
The 1528-15 drives are designed to provide contamination control
within the sealed Head/Disk Assembly (HDA) throughout the life of the
drive with zero maintenance.
Air within the HDA is continuously recirculated and filtered through
a high efficiency filter. Air is ducted to and from the filter for
maximum pressure recovery and filter efficiency. Air within the HDA
may only enter the drive through a high-efficiency breather filter.
Data Transfers
--------------
1528-15 drives are capable of transferring data at 4.8 MBytes/sec. in
synchronous mode and 1.8 MBytes/sec in asynchronous mode. In some
configurations (e.g., short cable and fast host), the 1528-15 can
achieve faster asynchronous transfer rates.
Read-Ahead
----------
The read-ahead function causes the 1528-15 drive to transfer the
requested block into its buffer and continue to read sequential
blocks until the buffer is filled or another command is received.
On subsequent 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.
Through Parity
--------------
Data integrity is maintained in the 1528-15 drive by maintaining
parity from the SCSI interface, through the drive's buffer, to just
before the point where the data byte is converted to serial form
for transmission to the media.
N-Segment Data Buffer/Cache
---------------------------
The 256K data buffer is dynamically divided into segments with each
segment holding data from different areas of the disk. This maximizes
the improvement of read-ahead technology by greatly increasing the
probability of a cache hit.
This feature improves the performance of all types of system; from
single threaded DOS environments to complex architectures like UNIX
with its own system caches.
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