S T 2 7 4 A W R E N SEAGATE
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 5.25"/HH Cylinders 948| 940| |
Capacity form/unform 66/ 74 MB Heads 5| 8| |
Seek time / track 29.0/ 5.0 ms Sector/track 17| 17| |
Controller IDE / AT Precompensation
Cache/Buffer 32 KB LOOK-AHEAD Landing Zone
Data transfer rate 0.938 MB/S int Bytes/Sector 512
4.700 MB/S ext
Recording method RLL operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 10 50 | -40 70
Power: sleep W Humidity % 8 80 | 5 95
standby W Altitude km -0.305 3.048| -0.305 12.210
idle 18.0 W Shock g 2 | 32
seek 20.0 W Rotation RPM 3597
read/write W Acoustic dBA
spin-up W ECC Bit 56
MTBF h 40000
Warranty Month 12
Lift/Lock/Park YES Certificates CSA,SDA,FCC,IEC380,IEC435,...
**********************************************************************
L A Y O U T
**********************************************************************
SEAGATE ST274A/280A PRODUCT MANUAL 77765346-D
+--------------------------------------------------------+
|+-+LED |XX Power
|+-+ |XX
| |+-+
| || | J2
| |+-1
| |+-+
| |+-+Master
| |1-+Slave
| |XX
| |XX 40 pin
| |XX I/O
| |.X J3
| |XX
| |XX
| |XX
| |XX1
+--------------------------------------------------------+
**********************************************************************
J U M P E R S
**********************************************************************
SEAGATE ST274A/280A PRODUCT MANUAL 77765346-D
Jumper setting
==============
J2 for factory use.
Master/Slave Present
--------------------
1 & 2 ON Drive is master
OFF Drive is slave
BA0/No Slave Present Jumper
---------------------------
3 & 4 ON For regular models, jumper, is present, must remain on.
Drive will not operate correctly if jumper is removed.
For "C" models, jumper ON indicates no slave present; jumper OFF
means slave drive is present.
The 94204 is capable of operating on the AT bus in a daisy chained
configuration with a second drive/controller that operates in
accordance with these specifications. One drive is designated as
master and the other as the slave. Models 94204-65C, 94204-71C,
94204-74C and 94204-81C can be daisy chained in either configuration
with other compatible drives that conform to the proposed ANSI ATBUS
definition.
Selection of the Master drive is made by a jumper plug installed on
two pins on a connector header to the right of the 40 pin interface
connector at the rear of the drive. No jumper plug present means the
drive is the slave. When it is intended that a drive should be the
slave, do not store the removed jumper plug on any other pins of the
connector, as that will cause the drive to operate incorrectly.
Slave Present Selection
-----------------------
Slave Present Selection is made by removing the jumper from the pins
adjacent to the Master/Slave select jumper. A jumper plug installed
means that no slave drive is present.
J3 DC Power and pin connector assignments
-------------------------------------------
+------------+ pin 1 +12 VDC
| 1 2 3 4 | pin 2 +12 Volts Return
+------------+ pin 3 + 5 Volts Return
pin 4 + 5 VDC
**********************************************************************
I N S T A L L
**********************************************************************
SEAGATE ST274A/280A DRIVE PRODUCT MANUAL 77765346-D
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
UNACCEPTABLE! UNACCEPTABLE!
Never install PC board on the Top!
Drive Orientation
-----------------
The permissible drive mounting orientation include operation in the
horizontal plane and in the vertical plane. Mounting with either end
down (front or rear) is not permissible. An angle of 15* up from the
horizontal (front end only) is acceptable for the horizontal orienta-
tion.
WREN 2HH (AT interface) is designed, manufactured, and tested with a
"Plug-in and Play" installation philosophy. Basically, this
philosophy minimizes the requirements for highly trained personnel
to integrate the WREN 2HH (At interface) into an OEM's system, wether
in a factory or field environment.
Cooling
-------
Cabinet cooling must be designed by the customer so that the ambient
temperature immediately surrounding the WREN 2HH (AT interface) will
not exceed temperature conditions.
Service Tools
-------------
No special tools are required for site installation or recommended
for site maintenance. The depot repair philosophy of WREN 2HH (AT
interface) precludes the necessity for special tools. Should field
repair of items external to the HDA be desired, one 6 point size
T10 Torx driver is required. This hand tool may be ordererd through
most commercial tool catalogs.
Air Cleanliness
---------------
The WREN 2HH (AT interface) is designed to operate in a typical
office environment with minimal environment control.
Physical Interface
------------------
The physical interface consists of single ended TTL compatible re-
ceivers and drivers communicating through a 40 conducter flat ribbon
nonshielded cable maximum length 24 inches (0.61 metre) using
asynchronous interface protocol.
Interface cabling options
-------------------------
+-------------------------------------+
| HOST |
| I/O |
+---------+---------------------------+
|
|
+----------------+
+---------+--+ +----------+--+
| 'AT' | | 'AT' |
| WREN | | WREN |
+------------+ +-------------+
If you have a 94204-xxC, then you can connect two different model
drives on the same host adapter. (i.e. a 94204-xxC and a 94354-xxx
drive)
If you do not have a "C" after the model number, then you can only
connects two similar WREN 2 94204-xx model drives.
DC Cable and Connector
----------------------
The WREN 2HH (AT interface) receives DC power through a 4 pin rigth
angle connector mounted on the main circuit board. Recommended part
numbers for the mating connector are included below, but equivalent
parts may be used.
Type of cable: 18 AWG
Connector: AMP 1-480424-0
Contacts: AMP 60619-4 (Loose Piece); AMP 61117-4 (Strip)
Device Grounding
----------------
The WREN 2HH (AT interface) is shipped with the DC Logic ground and
the chassis ground joined together. These two ground planes may be
separated by repositioning the motor control board ground washer.
Note: If the grounds are to be separated, the washer must be oriented
so that it does not contact the ground run near the screw at any
point.
System Ground Quick Connect Terminal
------------------------------------
System ground may be connected to the Quick connect terminal.
Recommended part numbers for this connector and the mating ground
cable connector are listed, but equivalent parts may be used.
Drive Connector Terminal: AMP P/N 61664-1
Cable Connector Terminal: AMP P/N 62137-2
I/O Cable and Connector
-----------------------
The I/O connector is a 40 pin connector. The odd pins are located
along the edge of the printed circuit board with pin 1 leftmost. The
even pins are on the side away from the edge of the printed circuit
board. A key is provided by the removal of Pin 20. The corresponding
pin on the cable connector should be plugged. Seagate recommends
keying this connector to prevent the possibility of installing it
upside down.
Maximum I/O cable length is 24 inches (.61 metres).
Recommended part numbers for the mating connector are included below,
but equivalent parts may be used.
Connector: 40 pin, 3M-3417-7000 (Strain relief 3448-2040)
Cable: Flat Cable (Stranded AWG 28) 3M-3365-40
Flat Cable (Stranded AWG 28) 3M-3517-40 (Shielded
Cable)
**********************************************************************
F E A T U R E S
**********************************************************************
SEAGATE ST274A/280A PRODUCT MANUAL 77765346-D
General Description
-------------------
The WREN 2HH (AT interface) drives are members of a family of low
cost, high performance, highly reliable, random access storage
devices designed to meet the needs of the OEM, AT (IDE) compatible,
marketplace.
Standards
---------
The WREN 2HH (AT interface) has been developed as system peripherals
to the highest standards of design and construction. The WREN depends
upon their host equipment to provide adequate power and environment
in order to achieve optimum performance and compliance with
applicable industry and governmental regualations. Special attention
must be given in the areas of safety, power distribution, shielding,
audible noise control, and temperature regulation.
The WREN 2HH (AT interface) is a UL Recognized component per UL 478
and a CSA Certified product per CSA C22.2 No. 220-M1986. It also
meets the requirements of DIN IEC 380/VDE0806/8.81, DIN IEC 435/VDE
0805/11.84 and EN 60950/09.87.
The WREN 2HH (AT interface), as delivered, is designed for system
integration before use. It is supplied as a Class A Computing Device
per the FCC Rules and Regulations, Part 15, Subpart J governing EMI
of computing devices and the Radio Interference Regulations of the
Canadian Department of Communications.
The head, disc and actuator chamber (HDA) is environmentally sealed
at the factory. Air is recirculated within the HDA and passes through
a nonreplaceable filter to ensure the maintenance of a contamination
free disc/actuator environment.
The WREN 2HH uses a dedicated landing zone at the innermost
radius of the media thus eliminating the possibility of destroying or
degrading data by landing in the data zone.
The WREN 2HH incorporate an automatic shipping look which prevents
potential damage to the heads and discs caused by movements during
shipping and handling. The shipping lock is automatically disengaged
when power is applied to the drive.
The WREN 2HH (AT interface) decodes Track 0 location from the
dedicated servo surface thereby eliminating mechanical transducer
adjustments and related reliability concerns.
The WREN 2HH (AT interface) uses a high performance actuator assembly
consisting of a low inertia, balanced, patented, straight arm driven
by a highly efficient pancake coil assembly. This patended actuator
mechanism provides excellent performance with minimal power dissipa-
tion.
Media Description
-----------------
The media used on the WREN 2HH (AT interface) has a diameter of
approximately 5 inches (130 mm). The aluminum substrate is coated
with lubricated ferrous oxide which permits the heads to contacts the
surface when starting and stopping.
Media defects are characterized as beeing either correctable or un-
correctable as a function of the type and magnitude of the media
flaw. A 56 bit error correction code is used to identify and correct
errors in the data read from the disc. In the WREN 2HH (AT interface)
media certification is performed using the following standards:
An error burst of 11 bits or less is a correctable error.
An error burst greater than 11 bits in length is an un-
correctable error.
At the time of shipment from the point of manufacture, the WREN 2HH
(AT interface) recording surfaces will meet the following
requirements.
1. 948 total physical tracks per surface (94204-65/74).
1032 total physical tracks per surface (94204-71/81).
2. Track 0 to be error free on each data surface.
3. 30 defects per surface maximum.
4. Accumulative defects not to exceed one per megabyte, based
on total available unformatted drive capacity.
5. Unidentified correctable errors shall not exceed two per
surface.
Seek Time
---------
|WREN 2HH|
----------------------------------+--------+
Track-to-Track msec. typ. | 5 |
Average msec. typ. | 29 |
Average msec. max. | 65 |
Latency msec. avg. | 8.34 |
----------------------------------+--------+
Seek time is defined as the time required from the receipt of a Seek
Command by the WREN 2HH (AT interface) until the completion of the
seek operation. Average seek time is determined by dividing the sum
of the time for all possible seek movements by the total number of
seek movements.
Spindle Speed and Latency
-------------------------
The spindle speed is 3597 0.5% r/min. The speed tolerance includes
motor performance and motor control circuit tolerances.
The average latency time is 8.34 milliseconds, based on a nominal
disc speed of 3597 r/min. The maximum latency time is 16.76 milli-
seconds based on a minimum disc speed of 3579 r/min.
Host/Drive Interface data transfer rate
---------------------------------------
Maximum instantaneous: 4,750 kbytes/s
Maximum average: 830 kbytes/s
Power Sequencing
----------------
Power sequencing is not required for the WREN 2HH. If the Delayed
Motor Start jumper configuration is off, the slave drive motor start-
up is delayed 20 seconds from power on.
Temperature
-----------
50*F to 122*F (10*C to 50*C) operating ambient with a maximum
gradient of 18* F (10* C) per hour. Above 1000 feet (305 metres)
altidude the maximum temperature is derated linearly to 95* F (35*C)
at 10,000 feet (3048 metres). Cabinet packaging designs must provide
ample air circulation around the WREN 2 to ensure environmental
limits are not exceeded as a result of heat transfer from other
system components. Operating ambient for specification purposes is
defined as the environment immediately surrounding the WREN 2. The
temperature of the HDA is restricated to a maximum of 143*F (62* C)
during operation.
Write Precompensation Cylinder
------------------------------
The starting cylinder for write precompensation is controlled by the
contens of this register. The starting physical cylinder is 4 times
value in this register. This register is ignored by the WREN 2HH
(AT interface). Use of write precompensation is controlled by the
drive.
Reliability
-----------
The following reliability specifications assume correct host/drive
operational interface has been implemented, including all interface
timings, power supply voltages, environmental conditions, and
appropriate data handling circuit to the host system.
MTBF 40,000 hours
Service Life 5 years
Preventive Maintenance None required
**********************************************************************
G E N E R A L
**********************************************************************
SEAGATE SUPPORT SERVICES
Seagate Technology
------------------
Technical Support Services
If you need assistance installing your drive, consult your dealer.
Dealers are familiar with their unique system configurations and can
help you with system conflicts and other technical issues. If you
need additional assistance with your Seagate(r) drive or other
Seagate products, use one of the Seagate technical support services
listed below.
SeaFONE at 1-800-SEAGATE (1-800-732-4283)
Seagate's 800 number allows toll-free access to automated self-help
services, providing answers to commonly asked questions,
troubleshooting tips and specifications for disc drives and tape
drives. This service is available 24 hours daily and requires a
touch-tone phone. If you need to speak to a technical support
engineer, dial this number and listen to the options for technical
support. (International callers can also reach this automated
self-help service by dialing 408-456-4496).
Seagate Technology online services
Using a modem, you can obtain troubleshooting tips, free utility
programs, drive specifications and jumper settings for Seagate's
entire product line. You can also download software for installing
and analyzing your drive.
SeaNET
You can obtain technical information on Seagate drives, Seagate
software and much more over the Internet from Seagate's World Wide
Web home page (http://www.seagate.com) or Seagate's ftp server
(ftp://ftp.seagate.com).
You may also send E-mail with your questions to DiscSupport@
Seagate.com or TapeSupport@Seagate.com.
SeaBOARD
SeaBOARD is a computer bulletin board system (BBS) that contains
information about Seagate's disc and tape drive products and is
available 24 hours daily. Set your communications software to eight
data bits, no parity and one stop bit (8-N-1). SeaBOARD phone numbers
are listed in the following table.
BBS Location Modem number
United States Disc: 408-434-1080; Tape: 408-456-4415
England 44-1628-478011
France 33 1-48 25 35 95
Germany 49-89-140-9331
Singapore 65-292-6973
Thailand 662-531-8111
Australia 61-2-9756-2359
Taiwan 886-2-719-6075
Seagate CompuServe forum
Online technical support for Seagate products is available on
CompuServe. To access our technical support forum, type go seagate.
This forum provides information similar to that found on SeaBOARD.
In addition, you can type questions or browse through previous
questions and answers on the forum messages.
Seagate Technology FAX services
SeaFAX
You can use a touch-tone telephone to access Seagate's automated FAX
system to receive technical support information by return FAX. This
service is available 24 hours daily.
Location Telephone number
United States 1-800-SEAGATE or 408-456-4496
England 44-1628-894084
Australia 61-2-9756-5170
Seagate technical support FAX
You can FAX questions or comments to technical support specialists 24
hours daily. Responses are sent during business hours.
Location FAX number
United States 408-944-9120
England 44-1628-890660
France 33 1-46 04 42 50
Germany 49-89-1430-5100
Australia 61-2-9725-4052
Singapore 65-293-4722
Hong Kong 852-2368 7173
Taiwan 886-2-715-2923
Korea 82-2-556-7294/4251
Seagate technical support
You can talk to a technical support specialist during business hours
Monday through Friday for one-on-one technical help. Before calling,
note your system configuration and drive model number (STxxxx). There
are several technical support phone numbers available for various
Seagate products.
Location Telephone number
United States Please dial 1-800-SEAGATE for the specific product
telephone number.
(6:00 A.M. to 11:15 A.M., 12:30 P.M. to 5:00 P.M.,
Pacific time, M-F)
England 44-1628-894083 (10:00 A.M. to 1:00 P.M., 2:00 P.M. to
5:00 P.M., M-F)
France 33 1-41 86 10 86 (9:30 A.M. to 12:30 P.M., 2:00
P.M. to 5:00 P.M., M-F)
Germany Disc: 49-89-140-9332; (9:30 A.M. to 12:30 P.M., 2:00
P.M. to 4:00 P.M., M-F)
Tape: 49-89-140-9333
Australia 61-2-9725-3366 (9:00 A.M. to 5:00 P.M., M-F)
Singapore 65-290-3998 (9:00 A.M. to 12:00 P.M., 2:00
P.M. to 5:00 P.M., M-F)
Hong Kong 852-2368 9918
Taiwan 886-2-514-2237
Korea 82-2-556-8241
SeaTDD 408-944-9121
Using a telecommunications device for the deaf (TDD), you can send
questions or comments 24 hours daily and exchange messages with a
technical support specialist between 6:00 A.M. to 11:15 A.M. and
12:30 P.M. to 5:00 P.M. (Pacific time) Monday through Friday.
Customer Service Centers
Seagate direct OEM, Distribution, System Integrator and Retail
customers should contact your Seagate Service Representative for
warranty information. Other customers contact your place of
purchase. Seagate offers comprehensive customer support for all
Seagate drives. Seagate customer service centers are the only
facilities authorized to service Seagate drives. These services are
available worldwide.
Location Telephone number FAX number
United States 1-800-468-3472; 405-949-6740
Other Americas
(Canada & Brazil) 405-949-6706; 405-949-6738
Mexico 525-546-6965; 525-546-4888
Europe, Middle
East & Africa 31-2065-43300; 31-2065-34320
Asia Pacific &
Australia 65-485-3595; 65-485-4980
Japan 81-3-5462-2904; 81-3-3462-2979
Seagate, Seagate Technology and the Seagate logo are registered
trademarks of Seagate Technology, Inc. SeaFAX, SeaFONE, SeaBOARD,
SeaTDD, SeaNET, Medalist and DiscWizard are either trademarks or
registered trademarks of Seagate Technology, Inc. or one of its
subsidiaries. All other trademarks or registered trademarks are the
property of their respective owners.