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Native| Translation
------+-----+-----+-----
Form 5.25"/HH Cylinders 1776| | |
Capacity form/unform 340/ 389 MB Heads 7| | |
Seek time / track 15.0/ 4.0 ms Sector/track 54| | |
Controller SCSI2 SINGLE-ENDED Precompensation
Cache/Buffer 64 KB DUAL-PORTED Landing Zone
Data transfer rate 1.875 MB/S int Bytes/Sector 512
4.000 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 13.6 W Altitude km -0.061 3.048| -0.305 15.240
idle W Shock g 2 | 50
seek 14.8 W Rotation RPM 3600
read/write W Acoustic dBA 43
spin-up W ECC Bit 48
MTBF h 150000
Warranty Month 12
Lift/Lock/Park YES Certificates
**********************************************************************
L A Y O U T
**********************************************************************
MICROPL. 1684 PRODUCT DESCRIPTION 106467 REV. B
+---------------------------------------------------------+
| |+-+ J2
| +---------+ ||X|
| COMPONENT SIDE |SCSI | || | ID2
| |PROM U39 | || | ID1
| +---------+ |+-1 ID0
| |XX
| 1-+ W31++ |XX J1
| RN9 | | ++ |XX
| Terminator| | W2++ |XX
| | | W1|| |XX
| +-+ ++ |XX
| |XX
| W12 W13 |X1
| +----+ W14 +-+ |
| +----+ W3 | | |XX Power
| W9 +-+ |XX J3
+---------------------------------------------------------+ 1
See also the Micropolis 1683 disk drive description.
+--------------------------------------+
| ++J4 |
| ++ ++J5 |
| ++ |
| |
| J3 |
| J2 J1 xxxxxxxx|
+..........-XXXXXXXXXXXXXXXXXX-xxxxxxxx+
+---------1------------------1--------1+
Power
**********************************************************************
J U M P E R S
**********************************************************************
MICROPL. 1684 PRODUCT DESCRIPTION 106467 REV. B
Jumper setting
==============
x = Jumpers setting at factory
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 1684-7 disk 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.
SCSI ID = 0; factory default configuration.
In multiple-device systems, each drive must have its own unique ID
bit.
J2 Multi-Function Connector/Jumper Block
-----------------------------------------
J2 is a 24-pin, multi-function connector/jumper block that is used
for connecting 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 the drive is Ready
and lights the Ready LED.
23 +5V source for the LEDs.
J4/J5 Ground Connectors
------------------------
3/16-inch spade lugs J4 and J5 are provided for grounding.
System characteristics determine proper ground connection.
W1/W2/W31 Bus Termination Power Option
---------------------------------------
+-----------------------+------------------------------------+
| Jumpers | |
| W1 | W2 | W31 | |
+-------+-------+-------+------------------------------------+
| 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 W31 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 W31.
W3 Spindle Control Option
---------------------------
CLOSED The drive must wait for a START UNIT command to start the
spindle motor.
OPEN The drive automatically starts the spindle motor at
power-on. (Factory default configuration)
W9 Bus Parity Check Option
---------------------------
CLOSED The drive neither generates nor detects parity.
OPEN The drive generates parity and enables parity detection.
(Factory default configuration)
W12/W13 LED Color Option
-------------------------
W12 CLOSED The red LED is selected
W13 CLOSED The green LED is selected (Factory default)
W14 Frame Ground Option
------------------------
CLOSED Frame ground is connected to logic ground.
OPEN Frame ground is not connected to logic ground (Factory
default)
J3 DC Power and pin connector assignments
-------------------------------------------
+------------+ pin 1 +12 V
| 4 3 2 1 | pin 2 +12 Return
+------------+ pin 3 + 5 Return
pin 4 + 5 V
**********************************************************************
I N S T A L L
**********************************************************************
MICROPL. 1684 PRODUCT DESCRIPTION 106467 REV. B
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 1684-7 disk drives uses industry-standard mounting techniques for
5 -inch half-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).
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
frame. If the enclosure is small or natural convetion is limited,
a fan may be required. In any case, no point on the HDA assembly
should exceed 62*C (143*F).
Mounting Screws
---------------
4 per side 6-32 UNC-2B x 0.10 deep (thru hole).
4 on bottom 6-32 UNC-2B x 0.22 deep
Caution: To avoid restricting HDA sway space, the mounting screws
must not penetrate the side mounting holes more than .10 (+.00,
-.03) inch or the bottom mounting holes by more than .20 (+.00, -.03)
inch. Torque applied to the screws must not exceed 8 in-lbs.
Interface Electrical Characteristics
------------------------------------
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 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) = 4.0 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 1684-7 disk drive provides keyed connectors to prevent accidental
grounding or misconnection of terminator power.
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.
J3 DC Power Connector
----------------------
J3 is a 4-pin, keyed, AMP MATE-N-LOCK connector on the Motor Control
board. Both +5V and +12V is 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.
Interface Terminator
--------------------
Interface Terminator pack RN9 provides proper termination for the
interface lines. For a multiple-device system, the terminator pack
is installed in the LAST drive on the cable.
Multiple-Drive Systems
----------------------
Up to seven 1684-7 disk 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 RN9 | |
o------+ J3 J4/J5 | |
---DC-VOLTAGES-----+ +--------+--------+ |
---GROUND--------------------------+------------------+
Interface Terminator RN9 is 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
---------------------------
The 1684-7 disk drive 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 1684-7, resulting in an MTTR of less
than 15 minutes.
Data Transfers
--------------
1684-7 drives are capable of transferring data at 4.0 MB/s in
SYNCHRONOUS mode and 1.6 MB/s in ASYNCHRONOUS mode.
Read-Ahead
----------
The read-ahead function causes the 1684-7 disk 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 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.
Data Buffer
-----------
The 64K data buffer may be divided into segments, with each segment
holding data from a different area of this disk.
Segmentation of the buffer maximizes the impact of read-ahead,
especially in a multi-tasking or multi-user environment. By
allocating a segment to each task or user, the chances of "cache
hits" and enhanced performance are greatly increased.
**********************************************************************
F E A T U R E S
**********************************************************************
MICROPL. 1684 PRODUCT DESCRIPTION 106467 REV. B
Command Pre-Processing
----------------------
Whenever possible, the 1684-7 disk drives prepares the next command
for execution (received from another host) while the current command
is executing. This feature takes advantage of any "dead" time, where
the drive's microprocessor would otherwise be inactive, such as
during a seek.
Like the read-ahead function, command pre-processing is a time
management technique that makes full use of the capabilities of the
1684-7 drive and enhances performance in multi-initiator systems.
Seek Time
---------
| 1684-7 |
----------------------------------+--------+
Track-to-Track msec. typ. | 4 |
Average msec. typ. | 15 |
msec. max | 30 |
One-Third Stroke msec. max. | 15 |
Latency msec. avg. | 8.33 |
Nominal msec. max. | 16.67 |
----------------------------------+--------+
The 1684-7 drive has programmable sectors sizes from 256 to 4000
bytes in 1-byte increments.
Defect Management
-----------------
The 1684-7 disk drive has two techniques available for defect
management: track-oriented and cylinder-oriented.
Disk/Spindle Assembly
---------------------
Up to four magnetic disks on the spindle assembly, which includes a
threephase brushless DC motor (commutated by three Hall-effect
sensors). The casting supports each end of the spindle.
Interface
---------
The 1684-7 disk drive is fully compatible with the Small Computer
System Interface (SCSI) proposed by the American National Standards
Committee.
Formatted Capacity Calculation
------------------------------
The formatted capacity of the 1684-7 disk drive depends upon a number
of user-selectable variables. One very critical variable is sparing,
either track-oriented or cylinder-oriented.
The following formula is used to calculate the formatted capacity (C)
of the 1684-7 drive using cylinder-oriented sparing:
C = [(SPT x HDS) - (SPARE_SPC)] x (1780 - 3 - SPARE_CYL) x (BYTES)
SPARC SPC is the number of spare sectors per cylinder. This variable
is user programmable. The recommended value for the 1684-7 drive is
4.
1780 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.