3 2 4 3 A V SINGAPORE
Native| Translation
------+-----+-----+-----
Form 3.5"/HH Cylinders 4097| | |
Capacity form/unform 4351/ 5071 MB Heads 19| | |
Seek time / track 8.5/ 1.5 ms Sector/track | | |
Controller SCSI2 SI/FAST/AV Precompensation
Cache/Buffer 512 KB SEGMENTED Landing Zone
Data transfer rate 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 5 50 | -40 65
Power: sleep W Humidity % 10 90 | 10 95
standby W Altitude km -0.061 3.048| -0.305 15.240
idle 14.0 W Shock g 5 | 60
seek 17.0 W Rotation RPM 7200
read/write W Acoustic dBA 37
spin-up W ECC Bit 126,REED SOLOMON
MTBF h
Warranty Month
Lift/Lock/Park YES Certificates AV PERFORMANCE ENHAN,ISO9000
**********************************************************************
L A Y O U T
**********************************************************************
MICROPL. 3243 CAPRICORN PRELIMINARY PRODUCT DESCRIPTION 138008 REV. 1
+---------------------------------------------------------+
| W2 |XX
| W1+-+ |XX
| W3| | |XX
| W4+-+ |XX
| |XX J1
| +-+ID0 |XX
| | |ID1 |XX
++ LED | |ID2 |XX
++ +-+RESERVED |XX
XX 27 |XX
XX |XX
XX |XX
XX Option Jumper |XX
XX Block |XX1
XX COMPONENT SIDE |XX
XX NO. 138032 |XX J1A
| 1 |XX
+---------------------------------------------------------+ 1
**********************************************************************
J U M P E R S
**********************************************************************
MICROPL. 3243 CAPRICORN PRELIMINARY PRODUCT DESCRIPTION 138008 REV. 1
Jumper Setting
==============
x = Factory default
Option Jumper Block
-------------------
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
LED+-+ - |27|25|23|21|19|17|15|13|11|09|07|05|03|01|
---+-+-----+ | | | | | | | | | | | | | +-------
+ |28|26|24|22|20|18|16|14|12|10|08|06|04|02|
++-++-++-++-++-++-++-++-++-++-++-++-++-++-+
RESERVED --+ | | | | | | | | | | | | +-- Remote LED
Key 2 NC -----+ | | | | | | | | | | +----- ID0
SSYNC --------+ | | | | | | | | +-------- ID1
MSYNC -----------+ | | | | | | +----------- ID2
Key 1 NC --------------+ | | | | +-------------- RESERVED
PTY -----------------+ | | +----------------- SP0
WP --------------------+ +-------------------- SP1
Option Jumper Block Pin Assignments
-----------------------------------
+---+---------------+---+--------------+
|Pin| Signal Name |Pin|Signal Name |
+---+---------------+---+--------------+
| 1 |Remote LED | 2 |Remote LED +5V|
+---+---------------+---+--------------+
| 3 |GROUND | 4 |ID0 |
+---+---------------+---+--------------+
| 5 |GROUND | 6 |ID1 |
+---+---------------+---+--------------+
| 7 |GROUND | 8 |ID2 |
+---+---------------+---+--------------+
| 9 |GROUND |10 |RESERVED |
+---+---------------+---+--------------+
|11 |GROUND |12 |SP0 |
+---+---------------+---+--------------+
|13 |GROUND |14 |SP1 |
+---+---------------+---+--------------+
|15 |GROUND |16 |WP |
+---+---------------+---+--------------+
|17 |GROUND |18 |PTY |
+---+---------------+---+--------------+
|19 |N/C |20 |KEY 1 |
+---+---------------+---+--------------+
|21 |GROUND |22 |MSYNC |
+---+---------------+---+--------------+
|23 |GROUND |24 |SSYNC |
+---+---------------+---+--------------+
|25 |N/C |26 |KEY 2 |
+---+---------------+---+--------------+
|27 |RESERVED |28 |RESERVED |
+---+---------------+---+--------------+
Single-Ended Configuration Options
----------------------------------
SCSI ID
-------
NOTE:
There are two identical groups of address jumpers on the Device
Electronics board; use either group for address selection but not
both at the same time.
+----------+-----------------------+ Up to eight devices (the host
| SCSI ID | Jumpers | and seven targets) can be
| | ID2 | ID1 | ID0 | attached to the SCSI Bus.
+----------+-------+-------+-------+
| 0 | OPEN | OPEN | OPEN | ID jumpers ID0, ID1 and ID2
| 1 | OPEN | OPEN | CLOSED| are used to assign one of
| 2 | OPEN | CLOSED| OPEN | eight SCSI ID bits (0-7) to
| 3 | OPEN | CLOSED| CLOSED| the drive.
| 4 | CLOSED| OPEN | OPEN |
| 5 | CLOSED| OPEN | CLOSED| In multiple-device systems,
| 6 | CLOSED| CLOSED| OPEN | each drive must have its own
| x 7 | CLOSED| CLOSED| CLOSED| unique ID.
+----------+-------+-------+-------+
SP0/SP1 Spindle Control Option
-------------------------------
SP0 CLOSED
SP1 OPEN Spindle motor starts when START UNIT command is
received.
SP0 OPEN (default)
SP1 OPEN Spindle motor starts at power-on.
SP0/SP1 Spindle Delay Option
-----------------------------
SP1 CLOSED
SP0 OPEN Spindle start-up is delayed based on SCSI ID (12
seconds per ID).
SP1 OPEN (default)
SP0 OPEN Spindle motor starts at power on.
WP Write Protect Option
------------------------
WP CLOSED Drive is write protected.
WP OPEN Drive is not write protected. (default)
PTY Bus Parity Check Option
----------------------------
PTY CLOSED Drive neither generates nor detects parity.
OPEN Drive generates parity and has parity detection
enabled. (default)
W1/W2/W3 Bus Termination Power Option
--------------------------------------
+-----+ +-----+ +-----+ +-----+
W1 xxx | | o X W2 | o o | | o o |
| o o | | o x | | xxx W3 | o o |
| o o | | o o | | o o | | xxx W4
+-----+ +-----+ +-----+ +-----+
W1 CLOSED (default)
Drive provides terminator power.
W2 CLOSED
Host system provides terminator power (via J1 pin 26).
W3 CLOSED
Drive provides terminator power (via J1, pin 26) to the BUS.
W4 Interface Termination
------------------------
W4 INSTALLED Drive is not terminated
x OMITTED Drive is terminated.
Spindle Synchronization
-----------------------
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 supplied by an external source.
Master: If the drive is set to Master (RPL = 10b), it generates the
SLAVE SYNC output signal 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. This output is used by the
controller to generate the SLAVE SYNC signal for the slaves.
**********************************************************************
I N S T A L L
**********************************************************************
MICROPL. 3243 CAPRICORN PRELIMINARY PRODUCT DESCRIPTION 138008 REV. 1
Notes on installation
=====================
Recommended mounting orientation
--------------------------------
horizontally vertically
+-----------------+ +--+ +--+
| | | +-----+ +-----+ |
| | | | | | | |
+-+-----------------+-+ | | | | | |
+---------------------+ | | | | | |
| | | | | |
| | | | | |
| +-----+ +-----+ |
+--+ +--+
Dimensions and Mounting
-----------------------
The drive uses industry-standard mounting For 3 1/2-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.
No matter what mounting orientation is used, Micropolis specifies
that the maximum HDA casting temperature not exceed 60*C (140*F).
Mounting Screws
---------------
3 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.
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.
For active termination, the assigned signals are terminated with 110
ohms to +2.85V (nominal). For passive termination, the assigned
signals are terminated with 220 ohms to +5V (nominal) and 330 ohms to
ground. All signals use open-collector or tri-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 (flat or
twisted-pair) cable. A characteristic impedance of 100 ( 10%) ohms
is recommended.
a. Input Characteristics
Each of the drive's signal receivers has the following
characteristics when measured at the interface connector.
1) Low-level input voltage = (Signal true) 0.0 VDC to 0.8 VDC
2) High-level input voltage = (Signal false) 2.0 VDC to 5.25 VDC
3) Low-level input current = -0.4 milliamps at 0.5 VDC
4) High-level input current = 0.1 milliamps at 2.7 VDC
5) Minimum input hysteresis = 0.2 VDC
6) Maximum input capacitance = 25 pF
b. Output Characteristics
Each driven signal has the following characteristics when
measured at the interface connector.
1) Low-level input voltage = 0.0 VDC to 0.5 VDC (signal assertion)
2) High-level input voltage = 2.5 VDC to 5.25 VDC (signal negation)
3) Minimum driver output capability = 48 milliamps (sink) at 0.5VDC
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).
Keyed connectors are provided to prevent accidental grounding or
misconnection of terminator power.
Signal Connector J1
-------------------
J1 is a 50-pin 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.
J1A Power Connector
-------------------
J1A is a 4-pin connector used to supply +5V and +12V to the drive.
Recommended mating connector: AMP 1-480424-0 or equivalent
Pins: AMP 350078-4
Suggested wire size: 18 AWG (minimum) for all pins.
pin 1 +12 VDC
pin 2 +12 Volts Return
pin 3 + 5 Volts Return
pin 4 + 5 VDC
2-pin Connectors (Remote LED, Spindle Sync, etc.)
-------------------------------------------------
Recommended mating connectors: Dupont 69305-002 or equivalent
Pins: Dupont 77138-001
Suggested wire size: 26-30 AWG for all pins
SCSI ID Connector (6-pin)
-------------------------
Recommended mating connector: Dupont 90311-006 or equivalent
Pins: Dupont 77138-001
Suggested wire size: 26-30 AWG for all pins
Multiple-Drive Systems
----------------------
Drive #1
+------HOST------+ +-----------------+
| +-----------+ +--+-SCSI-BUS-----+ J1 |
| |Terminators| | | +------+ J1A |
| +-----------+ | | | +-----------------+
| | | |
+----------------+ | | Drive #2
| | +-----------------+
+-------+------+ J1 |
| o------+ J1A |
| | +-----------------+
| |
| | Drive #3
| | +-----------------+
+-------+------+ J1 |
| o------+ J1A |
| | +-----------------+
| |
| | Drive #4
| | +--------------+--+
+-------+------+ J1 |T |
o------+ J1A +--+
---DC-VOLTAGES-----+ +-----------------+
T = TERMINATORS
Terminators are installed ONLY in the last physical drive in the
control chain.
Temperature Measurement
-----------------------
Micropolis specifies the maximum HDA casting temperature to be 60*C
(140*F). Not exceeding this temperature will ensure that the head-to-
media interface never exceeds its temperature limit.
If the HDA casting temperature measurement cannot be made, the
ambient air temperature around the drive must be kept at or below
50*C (122*F).
**********************************************************************
F E A T U R E S
**********************************************************************
MICROPL. 3243 CAPRICORN PRELIMINARY PRODUCT DESCRIPTION 138008 REV. 1
Description
-----------
This Product Description describes the Micropolis model 3243 (8-bit,
single-ended) Rigid Disk Drive. The drive is a member of the
CAPRICORN family of high-performance, 3 1/2-inch, full-height Rigid
Disk Drives.
These drive provides OEMs with random-access, high-speed, data
storage and meet the needs of diverse applications environments.
The drive is compatible with the "ANSI CCS" version and the "SCSI-2"
version of the industry-standard Small Computer System Interface
(SCSI) specification.
3243 AV
-------
The 3243 is available in an AV version. AV drives are specifically
designed for enhanced digital audio and video performance in
applications such as multi-media, desktop publishing, digital video
editing, and video servers. AV drives provide:
- Predictable, sustained data rates, allowing reduction in size of
system buffers needed thereby reducing system cost.
- Fast command processing for reduced overhead.
- Advanced cache management for improved overall performance.
- Fast ECC which ensures maximum data integrity without interrupting
the data stream.
DIFFERENTIAL INTERFACE IS OPTIONAL.
Some Features of the Drive
--------------------------
- Positive media protection is achieved during spin down (due to a
STOP UNIT command or power off) by automatically retracting and
locking the positioner in a data-free landing zone.
- N-Segment Read-Ahead algorithm improves read performance by
allowing many accesses to be serviced from the cache buffer (512K
or optional 2MB).
- Optional, Write-Behind Caching provides dramatic improvement in
write performance by appending multiple write commands per disk
revolution.
- In-Line Defect Management (sector slipping) provides maximum
throughput.
- Data Integrity is ensured with CRC through the buffer, 126-bit
Reed-Solomon ECC on-the-fly, and automatic retries using servo and
data strobe offsets.
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 clocks from Index (CFI).
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).
A printed listing of the defects is also shipped with each drive. The
entries it contains can be mapped out (reassigned) automatically at
format control parameter bits.
Seek Time
---------
| 3243 |
----------------------------------+--------+
Track-to-Track read msec. typ. | 1 |
write msec. typ. | 2 |
Average msec. typ. | 8.5 |
msec. max. | 20 |
Latency msec. avg. | 4.17 |
----------------------------------+--------+
Recording Media
---------------
Aluminium disks, each 95 millimeters (3 1/2 inches) in diameter, are
mounted on the spindle assembly. The recording surface on each disk
is a thin coating of magnetic material, with a carbon over-coat to
protect that surface.
Air Filtration System
---------------------
The drives are designed to provide contamination control within the
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.
Braking
-------
The heads contact an area of the disk surface which is not used for
data storage when the disk are not spinning and during start and
stop cycles. Dynamic braking is used to stop the spindle quickly.
Adjustments and Maintenance
---------------------------
The drive requires no adjustments or periodic maintenance;
additionally, no mechanical adjustments are required to prepare a
system for handling or shipment.
Field-Replaceable Components
----------------------------
The concept of repair by replacement of complete functional
components is utilized in the drive, resulting in an MTTR of less
than 15 minutes.
MICROPOLIS AV SERIES
--------------------
Micropolis AV Series disk drives are engineered specifically for
multi-media, high-end graphics, and digital video/audio applications.
With advanced cache management, internal housekeeping improvements,
and enhanced error handling, AV drives provide the highest minimum
sustained data rate in their class. AV drives are designed to provide
a maximum sustained uninterrupted data rate. Unlike data processing
drives, AV drives guarantee a "worst case" data rate performance.
This means that with the buffer empty, the maximum access time
(including error handling) is no more than 30 milliseconds.
**********************************************************************
G E N E R A L
**********************************************************************
MICROPOL. AV LT
What is an AV Drive?
--------------------
Today's demanding digital video and audio applications require disk
drives to sustain a pre-determined minimum data transfer rate.
Any interruptions in this data rate are detrimental to AV
applications that require constant delivery of data at 30 frames per
second minimum. In standard drives utilized for data processing
requirements, the error correction and thermal calibration methods
employed are not optimized for continuous delivery of data. These
routine housekeeping tasks will procedure gaps in the data stream as
long as 850 ms, resulting in jumps, gaps, and stutters in motion and
sound when used in most AV applications.
(MICROPOLIS 10/96)
Installation Guide for IBM PC & Compatible
==========================================
Daisy Chain Option Kit
----------------------
The MICRODISK AV LT subsystem will normally be last SCSI device on
the daisy chain. However, if you wish to daisy chain your MICRODISK
AV LT subsystem to other SCSI devices, you will need one Daisy Chain
Option Kit. This kit includes one each of the following items:
- SCSI System Cable (right angle connector)
- Daisy Chain (DCO) SCSI Backplane Cable
- MHA Rear Cover
Two SCSI system cables are available. Both cables have a Centronics
50-pin connector at the MICRODISK AV LT end, and either a Centronics
50-pin or mini-SCSI connector at the other end.
NOTE
Connect the SCSI system cable's right angle connector to the back of
the module.
Using the Daisy Chain Option Kit
--------------------------------
The MICRODISK AV LT subsystem will normally be the last SCSI device
on the daisy chain. However, if you wish to daisy chain your MICRO-
DISK AV LT subsystem to other SCSI devices, you will need one Daisy
Chain Option Kit.
To allow your MICRODISK AV LT subsystem to daisy chain to other SCSI
devices, you will remove the SCSI Backplane Cable from a MICRODISK AV
LT module (usually the TOP module in the stack), and replace it with
a Daisy Chain SCSI Backplane Cable. You will then install the MHA
rear cover, and connect the rightangle connector end of the SCSI
system cable to the Daisy Chain SCSI Backplane Cable connector, and
the other end (50-pin Centronics connector) to another SCSI device
outside the MICRODISK AV LT subsystem.
Installation Guide for IBM PC & Compatible
==========================================
Cables/Cords
------------
MICRODISK AV LT SCSI cables and AC power cords are manufactured to
the industry standard for this type of application. MICRODISK AV LT
module interconnect cables and cords have specific design features to
maintain both aesthetics and uncompromising performance.
Failure of any single power cord or SCSI cable will not cause data to
be lost. Failure of a single cord or cable may sometimes cause all
disk drive access to cease, but should never cause data stored on a
MICRODISK AV LT drive to be lost.
Getting Started
---------------
There are several kits that may be shipped for assembly and installa-
tion of a MICRODISK AV LT subsystem. The minimum MICRODISK AV LT
subsystem requires at least:
- One MICRODISK AV LT Module Kit.
- One MICRODISK AV LT System Configuration Kit.
- One SCSI/Power Cable Kit.
- One SCSI host adapter.
Depending on the configuration you may also need:
- Additional SCSI host adapters.
- One or more MICRODISK AV LT Module Kit(s).
- One or Expansion Kit(s).
- One or more MICRODISK AV LT Multiple Host Adapter (MHA) Option
Kit(s) .
- One or more MICRODISK AV LT Daisy Chain Option Kit(s).
CAUTION
Do not twist cable or cord connectors during unpacking or assembly;
damage may occur.
MICRODISK AV LT Module Kit
--------------------------
A MICRODISK AV LT Module Kit includes one each of the following
items:
- MICRODISK AV LT Module
- Front Cover
- Rear Cover
- Hardware Registration Card
- Read First Document
To increase available storage capacity, modules may be assembled in a
"stack".
If you use more than nine modules in your MICRODISK AV LT subsystem,
new stacks should be created to accommodate the additional modules.
NOTE
The maximum recommended number of modules in each stack is nine.
Only seven SCSI devices can be connected to a single host adapter
If you have more than seven modules in your stack, you must install a
second host adapter and use a Multiple Host Adapter (MHA) Option Kit.
If you create more than one stack, you will need one Expansion Kit
and one SCSI/Power Cable Kit for each additional stack you create.
System Configuration Kit
------------------------
MICRODISK AV LT subsystems are assembled with the components included
in the MICRODISK AV LT System Configuration Kit, Module Kit(s), and
SCSI/Power Cable Kits. One System Configuration Kit is required per
MICRODISK AV LT subsystem.
The MICRODISK AV LT System Configuration Kit includes one each of the
following items:
- Top Cover
- SCSI Terminator
- Base Assembly (with Power Switch)
- Read First Document
- Assembly and Installation Guide.
SCSI/Power Cable Kit
--------------------
One SCSI/Power Cable Kit is needed per stack. There are six types of
cable kits to address the Centronics SCSI Connector (ISA) or mini-
SCSI Connector (EISA/MCA) and three types of AC Power Cords
available: U.S., U.K., or European:
- U.S. Standard SCSI/Power Cable Kit
- U.S. Mini-SCSI/Power Cable Kit
- U.K. Standard SCSI/Power Cable Kit
- U.K. Mini-SCSI/Power Cable Kit
- European Standard SCSI/Power Cable Kit
- European Mini-SCSI/Power Cable Kit
Each type of SCSI/Power Cable Kit includes one each of the following
items:
- SCSI System Cable (Centronics SCSI)
- AC Power Cord
Expansion Kit
-------------
One Expansion Kit is necessary for every new stack you create.
An Expansion Kit includes one each of the following items:
- Top Cover
- SCSI Terminator
- Base Assembly (with Power Switch)
Multiple Host Adapter Option Kit
--------------------------------
One MHA Option Kit, required for each additional host adapter used
in any single stack, includes one each of the following items:
- SCSI System Cable (right angle connector)
- MHA SCSI Backplane Cable
- SCSI Terminator
- MHA Rear Cover
Two SCSI system cables are available. Both cables have a Centronics
50-pin connector at the MICRODISK AV LT end, and either a Centronics
50-pin, mini-SCSI, or mini-SCSI connector at the host adapter end.
NOTE
Connect the SCSI system cable's right angle connector to the back of
the module.
Compatible SCSI Host Adapters
-----------------------------
Your computer needs at least one SCSI host adapter in order to
communicate with modules in a MICRODISK AV LT subsystem. If you need
a SCSI host adapter or have any questions, please contact your
dealer. The following is a table showing the recommended MICRODISK AV
LT compatible SCSI host adapters:
+----------------+--------------------------------------+
| | Architecture |
|Company | ISA | EISA | MCA |
+----------------+--------------+-------------+---------+
|ADAPTEC |AHA1540B/42B |AHA1740/42A* |AHA1640* |
| |AHA1540C/42C | | |
+----------------+--------------+-------------+---------+
|ALWAYS TECH. |IN2000* | | |
+----------------+--------------+-------------+---------+
|BUSTEK/BUSLOGIC |BT540/42 |BT740/42* | |
+----------------+--------------+-------------+---------+
|DPT |PM2011 |PM2012B/90 | |
| | |PM2012B/95 | |
+----------------+--------------+-------------+---------+
|DTC |DTC3180A/3280A|DTC3190 | |
| | |DTC3290 | |
+----------------+--------------+-------------+---------+
|FUTURE DOMAIN |TMC1660* | | |
| |TMC1670* | | |
| |TMC1680* | | |
+----------------+--------------+-------------+---------+
|MYLEX | |DCE376* | |
+----------------+--------------+-------------+---------+
|ULTRASTOR |ULTRA14F* |ULTRA24F* | |
+----------------+--------------+-------------+---------+
* These host adapters do not accept the standard 50-pin SCSI
connector cable. Please contact your reseller to obtain the
appropriate cable if you have one of these host adapters.
Host Adapter Considerations
---------------------------
- One MHA Option Kit is required for each additional host adapter you
add to an existing stack.
- When installing host adapters, ensure that there are no port
address or IRQ conflicts with other cards already installed or
planned for installation. Refer to your host adapter documentation
for specific details.
MICRODISK AV LT Assembly
------------------------
A MICRODISK AV LT subsystem may be as small as one module, or you can
add modules to increase storage capacity and create multiple stacks
if you so desire.
The minimum MICRODISK AV LT configuration requires on MICRODISK AV LT
Module Kit, one System Configuration Kit, one SCSI cable, one power
cord, and one SCSI host adapter.
Terminator
----------
The terminator must installed in the last module in the chain for
each SCSI bus (Host Adapter).
MICRODISK AV LT Series Disk Drives
----------------------------------
Each module in a MICRODISK AV LT subsystem contains a MICRODISK AV LT
Series disk drive. MICRODISK AV LT Series disk drives are engineered
specifically for multimediam high-end graphics, and digital audio/
video applications.
MICRODISK AV LT Series disk drives have the highest minimum sustained
data rate in the industry in their class at 3.0 MB/sec, and a maximum
sustained uninterrupted data rate of 2.9 MB/sec. Industry standard
high capacity data processing drives are not designed for high
sustained, uninterrupted data rates - factors which are required for
real-time recording and playback of digital audio/video data.
Standard drives perform short, random "burst" transfers, leaving gaps
in the data stream.
MICRODISK AV LT Formatting/Partitioning
---------------------------------------
Your MICRODISK AV LT subsystem modules need to be formatted and
partitioned before they can be used for data storage. To perform
these functions, use the disk formatting/partitioning utility
program(s) that you received as part of your operating system
software.
The utilities prepare your MICRODISK AV LT modules for use. Under
normal circumstances you will only need to format and partition each
MICRODISK AV LT module once.
NOTE
Because each module in a MICRODISK AV LT stack is a separate,
independent SCSI device, you must format and partition each MICRODISK
AV LT module separately.
Formatting the Hard Disk
------------------------
Formatting lays down distinct patterns on the disk which set up the
disk's organizational structure. You normally need to format the disk
only once.
Installing Partitions
---------------------
Partitioning prepares a hard disk for use by the PC. Partitions allow
you to divide the space available on the hard disk into separate
areas which appear on the desktop as separate logical disk drives
(volumes). This allows more flexible management of files (i.e., you
can use one partition for word processing, another for database work,
etc.).
Management of back-up also becomes easier with a wellorganized and
partitioned hard disk. A large hard disk with many small files takes
up a lot of disk space because of the way the filing system allocates
disk space. You can save space by partitioning the hard disk into
smaller volumes.
Carefully plan your partitions, as you cannot change partitions with-
out erasing your data. If you choose to alter the sizes or types of
partitions, you should:
1. Back up all your files
2. Make partitioning changes
3. Restore the files to their new volumes.
CAUTION
Remember, you can change partitions later, but all the information
stored on them will be lost. Make sure you have all data from these
partitions backed-up before changing the partitions.
It is not necessary to reformat the disk to redefine the partitions.
MICRODISK AV LT Operation
-------------------------
The MICRODISK AV LT subsystem MUST be turned on prior to, or at the
same time as, your computer.
The MICRODISK AV LT subsystem MUST be turned on whenever your
computer is on.
