Seagate Flat Panel Television ST11950N ND W WD User Guide

BARRACUDA 1 and 2  
Disc Drive  
ST11950N/ND/W/WD  
ST12550N/ND/W/WD  
Installation Guide  
 
ST11950 and ST12550 Installation Guide, Rev. D  
1
Preface  
This manual contains information for users of the  
®
Seagate ST11950N/ND,ST11950W/WD, ST12550N/ND,  
and ST12550W/WD Barracuda™ SCSI disc drives. It  
providessupportservices,performance specifications,  
and initial setup information. Additional information is  
availablein theBarracuda1and2Product Manual(part  
number 83327780). Contact your Seagate sales rep-  
resentative if you need to order this publication.  
Electrostatic discharge protection  
Caution. Removal of circuit boards by personnel not  
performing depot repair will damage compo-  
nents and may void the warranty.  
All drive electronic assemblies are sensitive to static  
electricity, duetotheelectrostaticallysensitivedevices  
used within the drive circuitry. Although some devices  
such as metal-oxide semiconductors are extremely  
sensitive, all semiconductors, as well as some resis-  
tors and capacitors, may be damaged or degraded by  
exposure to static electricity.  
Electrostatic damage to electronic devices may be  
caused by the direct discharge of a charged conductor  
or by exposure to the static fields surrounding charged  
objects.Toavoiddamagingdriveelectronicassemblies,  
observe the following precautions when installing or  
servicing the drive:  
 
2
ST11950 and ST12550 Installation Guide, Rev. D  
• Ground yourself to the drive whenever the drive elec-  
tronics are or will be exposed. Connect yourself to  
ground with a wrist strap (Seagate part number  
12263496).Connectionmaybemadetoanygrounded  
metal assembly. As a general rule, remember that you  
andthedriveelectronicsmustallbegroundedtoavoid  
potentially damaging static discharges.  
• TurnoffthepowerbeforeremovingorinstallingtheDC  
power cable.  
• Do not remove any circuit boards from the drive.  
• Never use an ohmmeter on any circuit boards.  
Important safety information and precautions  
Caution. Useforced-airventilationwhenbench-testing  
the drive to ensure proper cooling of drive  
components.  
Usepropersafetyandrepairtechniquesforsafe,reliable  
operation of this unit. Service should be done only by  
qualifiedpersons.Werecommendtheproceduresinthis  
manual as effective ways of servicing the unit. Some  
procedures require the use of special tools. For proper  
maintenance and safety, you must use these tools as  
recommended.  
The procedures in this manual and labels on the unit  
contain warnings and cautions that must be carefully  
 
ST11950 and ST12550 Installation Guide, Rev. D  
3
read and followed to minimize or eliminate the risk of  
personal injury. The warnings point out conditions or  
practicesthatmayendangeryouorothers.Thecautions  
point out conditions or practices that may damage the  
unit, possibly making it unsafe for use.  
These warnings and cautions are not exhaustive. We  
cannotpossiblyknow,evaluate,andadviseyouofallthe  
ways in which maintenance might be performed or the  
possible risk of each technique. Consequently, we have  
not completed any such broad evaluation. If you use a  
non-approved procedure or tool, first ensure that the  
method you choose will not risk either your safety or unit  
performance.  
Alwaysobservethefollowingwarningsandprecautions:  
• Performallmaintenancebyfollowingtheproceduresin  
this manual.  
• Follow all cautions and warnings in the procedures.  
• Use sound safety practices when operating or repair-  
ing the unit.  
• Use caution when troubleshooting a unit that has  
voltages present. Turn off power to the unit before  
servicing it.  
• Wear safety shoes when removing or replacing heavy  
parts.  
 
4
ST11950 and ST12550 Installation Guide, Rev. D  
• Ensure that the internal temperature of the rack or  
cabinetdoesnotexceedthelimitsdefinedforthedrive  
when the drive is mounted in an equipment rack or  
cabinet. When units are stacked vertically, pay atten-  
tiontothetopwheretemperaturesareusuallyhighest.  
• Follow the precautions listed above in “Electrostatic  
discharge protection.”  
• Do not remove any circuit boards from the drive chas-  
sis. Returntheentiredrivefordepotrepairifanycircuit  
board is defective. Removal of circuit boards by per-  
sonnel not performing depot repair will damage com-  
ponents and may void the warranty.  
• Donotremovetheheadanddiscassembly(HDA)from  
the drive chassis. Return the entire drive for depot  
repair if the HDA is defective.  
• Do not attempt to disassemble the HDA. It is not field  
repairable. If the sealed HDA is opened by personnel  
not performing depot repair, this will damage compo-  
nents and void the warranty.  
As a component, this drive is designed to be installed  
and operated in accordance with UL1950, IEC950,  
EN60950, CSA C22.2 950, and VDE0805.  
Seagate takes all reasonable steps to ensure that its  
products are certifiable to currently accepted stan-  
 
ST11950 and ST12550 Installation Guide, Rev. D  
5
dards. Typical applications of these disc drives include  
customer packaging and subsystem design. Safety  
agencies conditionallycertifycomponentparts,suchas  
the Barracuda disc drive, based on their final accept-  
abilityintheend-useproduct.Thesubsystemdesigners  
are responsible for meeting these conditions of accept-  
abilityinobtainingsafety/regulatoryagencycompliance  
in their end-use products and for certifying where  
required by law. A necessary part of meeting safety  
requirements is the provision for overcurrent protection  
on drive SELV supply voltages.  
This unit is a component assembly and as such is not  
meant to comply with FCC or similar national require-  
mentsasastand-aloneunit.Engineeringradiatedemis-  
sions test results are available through the Seagate  
Safety Department to assist the subsystem designer.  
Wichtige Sicherheitshinweise  
Vorsicht. Beim Testen des Laufwerks auf dem  
Prüftisch ist Fremdbelüftung vorzusehen, um eine  
ausreichende Kühlung der Laufwerkkomponenten  
sicherzustellen.  
Verwenden Sie geeignete Sicherheits- und  
Reparaturverfahren, um den sicheren, zuverlässigen  
Betrieb dieser Einheit zu gewährleisten. Reparaturen  
 
6
ST11950 and ST12550 Installation Guide, Rev. D  
dürfen nur von qualifiziertem Fachpersonal  
vorgenommen werden. Wir empfehlen die Verfahren in  
diesem Handbuch als effektive Methoden zur  
Wartung und Reparatur der Einheit. Einige Verfahren  
erfordern Spezialwerkzeuge; diese müssen zur  
sachgemäßen Ausführung der Wartungsarbeiten und  
aus Sicherheitsgründen den Empfehlungen  
entsprechend verwendet werden.  
Die Verfahren in diesem Handbuch und die Aufkleber  
auf dem Gerät enthalten Warn- und Vorsichtshinweise.  
Diese Hinweise sind sorgfältig durchzulesen und zu  
beachten, um das Risiko von Verletzungen auf ein  
Mindestmaß zu beschränken oder ganz zu vermeiden.  
DieWarnhinweisemachenaufSituationenoderPraktiken  
aufmerksam, die Sie oder andere gefährden könnten.  
Die Vorsichtshinweise machen auf Situationen oder  
Praktiken aufmerksam, die die Einheit beschädigen  
können, so daß deren Gebrauch mit Risiko behaftet ist.  
Die Warn- und Vorsichtshinweise sind nicht  
allumfassend! Es ist uns einfach nicht möglich, alle  
WartungsmethodenoderdieeventuellenRisikenjeder  
Methode zu kennen, zu beurteilen und Sie  
entsprechend zu beraten. Aus diesem Grund haben  
wir auf eine derartige umfassende Beurteilung  
verzichtet. Falls Sie ein hier nicht beschriebenes  
Verfahren oder Werkzeug verwenden, stellen Sie  
 
ST11950 and ST12550 Installation Guide, Rev. D  
7
zuerst sicher, daß das gewählte Verfahren weder Ihre  
persönliche Sicherheit noch die Leistung der Einheit  
gefährdet.  
Beachten Sie in jedem Fall die folgenden Warn-und  
Vorsichtshinweise:  
• Führen Sie alle Wartungsarbeiten entsprechend den  
Anweisungen in diesem Handbuch aus.  
• Beachten Sie alle Warn- und Vorsichtshinweise in  
diesem Handbuch.  
• Treffen Sie beim Betrieb oder bei der Reparatur der  
Einheit angemessene Sicherheitsvorkehrungen.  
• Wenn eine Einheit unter Spannung steht, gehen Sie  
bei der Fehlerdiagnose besonders vorsichtig vor.  
Schalten Sie die Einheit aus, bevor Sie mit den  
Reparaturarbeitenbeginnen.  
• Tragen Sie Sicherheitsschuhe, wenn Sie schwere  
Teile aus- bzw. einbauen.  
• Wenn das Laufwerk in einem Einbaugestell oder  
Gehäuse montiert ist, sorgen Sie dafür, daß die  
Temperatur im Inneren des Gestells oder Gehäuses  
die für das Laufwerk vorgegebenen Grenzwerte nicht  
übersteigt. Wenn Einheiten vertikal übereinander  
betestigtwerden,achtenSiebesondersaufdenoberen  
Stapelbereich, da dort die Temperatur gewöhnlich am  
höchsten ist.  
 
8
ST11950 and ST12550 Installation Guide, Rev. D  
• Befolgen Sie die oben unter “Electrostatic Discharge  
Protection” angegebenen Sicherheitsmaßnahmen.  
• NehmenSiekeinePlatinenausdemLaufwerkgehäuse.  
Wenn eine Platine defekt ist, muß das gesamte  
Laufwerk zur Reparatur eingeschickt werden. Die  
HerausnahmevonPlatinendurchanderePersonenals  
die für die werkseitige Reparatur zuständigen kann zu  
einer Beschädigung der Komponenten und Erlöschen  
des Garantieanspruchs führen.  
• Die vormontierte Kopf- und Festplatteneinheit (HDA)  
nicht aus dem Laufwerkgehäuse nehmen! Falls die  
HDA beschädigt ist, schicken Sie das gesamte  
Laufwerk zur Reparatur ein.  
• Die HDA ist nicht vor Ort reparierbar und darf nicht  
auseinandergenommen werden! Öffnen der  
versiegelten HDA durch andere Personen als die für  
die werkseitige Reparatur zuständigen hat eine  
Beschädigung der Komponenten und Erlöschen des  
Garantieanspruchs zur Folge.  
Als Teilkomponente ist dieses Laufwerk für die Installa-  
tion und den Betrieb in Übereinstimmung mit UL 1950,  
IEC950, EN60950, CSA C22.2 950 und VDE0805  
vorgesehen.  
Seagate ist ständig bemüht, die Zulassungsfähigkeit  
von Seagate-Produkten im Rahmen der gegenwärtig  
 
ST11950 and ST12550 Installation Guide, Rev. D  
9
geltendenStandardszugewährleisten.Zudentypischen  
Anwendungen dieser Festplattenwerke zählen  
Systemeinbau durch den Kunden und die Konstruktion  
vonUntersystemen.Sicherheitsbehördengewähreneine  
bedingte Zulassung für Komponenten wie das Barra-  
cuda-Festplattenlaufwerkvorbehaltlichderendgültigen  
ZulasssungimEndprodukt.DesignervonUntersystemen  
sind dafür verantwortlich, die Voraussetzungen für die  
Einhaltung sicherheits- oder aufsichtsbehördlicher  
VorschrifteninihrenEndproduktenund-fallsgesetzlich  
vorgeschrieben - für die Zulassung zu schaffen.  
Eine Grundvoraussetzung zur Einhaltung der  
Sicherheitsanforderungen ist die Bereitstellung  
eines Überlastschutzes für die SELV-  
Versorgungsspannungen des Laufwerks.  
Dieses Gerät ist eine Baugruppe und unterliegt als  
solchenichtdenAnforderungenderFCCoderähnlicher  
nationaler Behörden für eigenständige Geräte.  
Technische Testergebnisse zu elektromagnetische  
Strahlung sind für Designer von Untersystemen auf  
Anfrage von der Seagate-Sicherheitsabteilung  
erhältlich.  
 
10 ST11950 and ST12550 Installation Guide, Rev. D  
Technical support services  
Seagate Technology provides technical support litera-  
ture and diagnostic utilities to authorized distributors.  
Please contact your dealer for technical support and  
installation troubleshooting. Producttechnicalsupport  
is available for all Seagate products by calling the  
SeaFAX™, SeaFONE™, SeaTDD™, or SeaBOARD™  
services. These are toll calls if you dial from outside of  
the number’s local dialing area.  
SeaFAX  
USA (408) 438-2620; England 44-62-847-7080  
Use a touch-tone telephone to access Seagate’s auto-  
mated FAX system and select technical support infor-  
mation by return FAX. This service is available 24 hours  
a day, 7 days a week.  
SeaFONE (408) 438-8222  
Technical support specialists are available from 8:00  
A.M.to 5:00 P.M.PST, Mondaythrough Friday.Recorded  
technical information on selected Seagate products is  
provided while you areon hold. Recordings areacces-  
sible 24 hours a day, 7 days a week.  
SeaTDD (408) 438-5382  
TDD is a telecommunication device for the deaf where  
two people can communicate using a keyboard that is  
connectedtothephoneline. ATDDdeviceisrequiredto  
 
ST11950 and ST12550 Installation Guide, Rev. D 11  
access this service, which is available from 8:00 A.M. to  
5:00 P.M. PST, Monday through Friday.  
SeaBOARD  
The Seagate Technical Support Bulletin Board System  
(BBS) is accessible by modem 24 hours a day, 7 days  
a week. The communications software must be set for  
eight data bits, no parity, and one stop bit (8N1). These  
BBS numbers operate at 9600 baud max. With this  
service you can access:  
• Specifications and jumper configurations for Seagate  
products  
• Reprints of Seagate documentation  
• A directory of information and helpful utilities that you  
can download to your own computer  
Telephone  
Location  
number  
USA, Mexico, Latin America  
England  
(408) 438-8771  
44-62-847-8011  
49-89-140-9331  
65-292-6973  
61-2-756-2359  
(416) 856-5581  
33-1-40-67-1034  
82-2-556-7294  
Germany  
Singapore  
Australia  
Canada  
France  
Korea  
 
12 ST11950 and ST12550 Installation Guide, Rev. D  
General description  
Barracuda 1 and 2 SCSI disc drives are high-speed,  
random-access digital-data storage devices. The  
ST11950N/ND and ST12550N/ND drives are illustrated  
inFigure1, and the ST11950W/WDandST12550W/WD  
drives are illustrated in Figure 2. Specifications and DC  
power requirements for the drive are listed in tables  
following the figure.  
The drive is a component for installation in an enclosure  
designed for the drive. This is often a rack within the  
system or an external enclosure designed to house one  
or more disc drives or other peripheral units. In either  
case,thediscdrivemustreceiveadequatecooling(refer  
to “Providing adequate cooling”) and it must be suffi-  
ciently grounded and shielded from emissions. The  
Barracuda 1 and 2 Product Manual (part number  
83327780) contains guidelinesforaproperlydesigned  
enclosure.  
 
ST11950 and ST12550 Installation Guide, Rev. D 13  
I/O Terminator Packs  
(single-ended I/O only)  
SCSI I/O  
Connector  
J01  
J4  
DC Power Connector  
Figure 1. Barracuda 1 and 2 disc drive (N/ND type)  
SCSI I/O  
Connector  
Pin 1  
J5  
J01  
J4  
DC Power  
Connector  
Figure 2. Barracuda 1 and 2 disc drive (W/WD type)  
 
14 ST11950 and ST12550 Installation Guide, Rev. D  
Characteristics  
ST11950N/ND ST11950W/WD  
Interface  
Fast SCSI-21  
Fast & Wide SCSI-21  
Multi-seg. cache  
1,024 Kbytes  
1,024 Kbytes (W)  
512 Kbytes (WD)  
Capacity  
Unformatted  
Formatted2  
2,030 Mbytes  
1,690 Mbytes  
2,030 Mbytes  
1,690 Mbytes  
Recording  
Cylinders (user)  
Heads  
2,706  
15  
2,706  
15  
Avg sectors/track  
Avg bytes/track  
Modulation  
81 (51h)  
49,768  
RLL 1,7 code  
81 (51h)  
49,768  
RLL 1,7 code  
SCSI rate  
Max burst transfer 10 Mbytes/sec 20 Mbytes/sec  
Seek time3  
Average read  
Average write  
8.0 msec  
9.0 msec  
8.0 msec  
9.0 msec  
Disc rotation  
RPM  
7,200  
7,200  
Average latency  
4.17 msec  
4.17 msec  
1Can also be operated according to SCSI-1 protocol.  
2Standard factory units are formatted as follows:  
512 data bytes per sector, 6 spare sectors per cylinder  
1 cylinder at the inner track reserved for spares  
3Not including on-board controller overhead.  
 
ST11950 and ST12550 Installation Guide, Rev. D 15  
Characteristics  
ST12550N/ND ST12550W/WD  
Interface  
Fast SCSI-21  
Fast & Wide SCSI-21  
Multi-seg. cache  
1,024 Kbytes  
1,024 Kbytes (W)  
512 Kbytes (WD)  
Capacity  
Unformatted  
Formatted2  
2,572 Mbytes  
2,139 Mbytes  
2,572 Mbytes  
2,139 Mbytes  
Recording  
Cylinders (user)  
Heads  
2,707  
19  
2,707  
19  
Avg sectors/track  
Avg bytes/track  
Modulation  
81 (51h)  
49,768  
RLL 1,7 code  
81 (51h)  
49,768  
RLL 1,7 code  
SCSI rate  
Max burst transfer 10 Mbytes/sec 20 Mbytes/sec  
Seek time3  
Average read  
Average write  
8.0 msec  
9.0 msec  
8.0 msec  
9.0 msec  
Disc rotation  
RPM  
7,200  
7,200  
Average latency  
4.17 msec  
4.17 msec  
1Can also be operated according to SCSI-1 protocol.  
2Standard factory units are formatted as follows:  
512 data bytes per sector, 9 spare sectors per cylinder  
1 cylinder at the inner track reserved for spares  
3Not including on-board controller overhead.  
 
16  
ST11950 and ST12550 Installation Guide, Rev. D  
DC power requirements  
for ST11950N/ND and ST12550N/ND drives  
Single-ended Differential  
+5V  
+12V  
+5V  
+12V  
Voltage regulation5  
± 5%  
± 5%2 ± 5% ± 5%2  
Amps  
0.95  
Maximum operating current1 1.1  
1.5  
0.95  
0.83  
Average idle current1, 12  
0.76  
0.83  
0.79  
Maximum starting current  
Peak DC3, 6  
1.0  
2.18  
3.1  
1.1  
1.1  
2.18  
3.1  
Peak AC3  
Delayed motor start (max)1, 4 1.06  
Peak operating current  
0.19  
0.2  
Typ DC1, 10  
Max DC1  
Max (peak)  
1.07  
1.1  
1.15  
0.91  
0.95  
1.87  
1.47  
1.5  
1.8  
0.91  
0.95  
1.86  
Track following (DC)  
at OD1  
1.0  
1.0  
0.84  
0.9  
1.1  
1.1  
0.84  
0.9  
at ID1  
Read track  
OD DC1, 14  
AC  
1.1  
1.2  
0.85  
1.2  
1.6  
1.8  
0.85  
1.2  
Seeking  
Typical DC1, 13  
Maximum DC1  
Maximum (peak) AC  
1.0  
1.1  
1.2  
1.2  
1.2  
1.8  
1.1  
1.2  
1.7  
1.2  
1.2  
1.8  
 
ST11950 and ST12550 Installation Guide, Rev. D  
17  
DC power requirements  
for ST11950W/WD and ST12550W/WD drives  
Single-ended Differential  
+5V  
+12V  
+5V  
+12V  
Voltage regulation5  
± 5% ± 5%2 ± 5% ± 5%2  
Amps  
0.95  
Maximum operating current1 1.04  
1.3  
0.95  
0.83  
Average idle current1, 12  
0.76  
0.83  
0.83  
Maximum starting current  
Peak DC3, 6  
1.0  
2.18  
3.1  
1.1  
1.1  
2.18  
3.1  
Peak AC3  
Delayed motor start (max)1, 4 1.0  
Peak operating current  
0.19  
0.19  
Typ DC1, 10  
Max DC1  
Max (peak)  
1.03  
1.04  
1.2  
0.91  
0.95  
1.87  
1.21  
1.3  
2.0  
0.91  
0.95  
1.87  
Track following (DC)  
at OD1  
1.0  
1.0  
0.84  
0.9  
1.1  
1.1  
0.84  
0.9  
at ID1  
Read track  
OD DC1, 15  
AC  
1.1  
1.3  
0.85  
1.2  
1.4  
2.0  
0.85  
1.2  
Seeking  
Typical DC1, 13  
Maximum DC1  
Maximum (peak) AC  
1.0  
1.1  
1.2  
1.2  
1.2  
1.8  
1.1  
1.2  
2.0  
1.2  
1.2  
1.8  
1Measured with an average reading DC ammeter. Instanta-  
neous +12V current peaks will exceed these values.  
continued  
 
18 ST11950 and ST12550 Installation Guide, Rev. D  
continued from previous page  
2 A 10% tolerance is permissible during initial start of the  
spindle but must return to ±5% before reaching 7,200RPM.  
The ±5% must be maintained after the drive signifies that its  
power-up sequence has been completed and that the drive  
is able to accept selection by the host initiator.  
3 See the +12V current profile in the Product Manual .  
4 This condition occurs when the Motor Start option is en-  
abled and the drive has not yet received a start motor  
command.  
5 See “Conducted noise immunity” in the Product Manual.  
The specified voltage tolerance is inclusive of ripple, noise,  
and transient response.  
6 At power-up, the motor current regulator limits the +12V  
current to an average value of less than 2.0A, although  
instantaneous peaks may exceed this value. These peaks  
should measure 5 msec duration or less.  
7 Minimum current loading for each supply voltage is not less  
than 7% of the maximum operating current shown.  
8 Use separate ground returns for +5 and +12V supplies.  
9 Where power is provided to multiple drives from a common  
supply, carefully consider individual-drive power require-  
ments.Wheremultipleunitsarepoweredonsimultaneously,  
be sure the peak starting current is available to each device.  
10 Operating condition is a third-stroke seek at OD and read  
one track. The command is issued every 0.07 seconds.  
continued  
 
ST11950 and ST12550 Installation Guide, Rev. D 19  
continued from previous page  
11No terminator power. See Section 11.7.3.4 in the Prod-  
uct Manual.  
12All power-saving features are enabled.  
13Seeking is defined as a third-stroke seek at OD. The  
command is issued every 20 msec.  
14Read track is defined as repeat reads of track 15 with a  
91% duty cycle.  
15Read track is defined as repeat reads of track 15 with a  
75% duty cycle.  
Initial setup information  
The following topics are presented to guide you through  
the installation process. These topics are presented in  
the order you should follow to properly install the drive.  
• Setting the SCSI ID jumpers  
• Terminating the drive  
• Changing other applicable jumper options  
• Synchronizing spindles  
• Providing adequate cooling  
• Mounting the drive and connecting cables  
• Formatting the drive  
Each option jumper illustration identifies the Original  
Equipment Manufacturer (OEM) default factory setting.  
These settings are the most common ones used but are  
not necessarily the ones set for your particular system.  
 
20 ST11950 and ST12550 Installation Guide, Rev. D  
Setting the SCSI ID jumpers  
EachdeviceontheSCSIchainmusthaveauniqueSCSI  
ID. The host system’s SCSI controller usually uses the  
highest-numbered ID available (ID7 in non-wide sys-  
tems); therefore the lower-numbered SCSI IDs are nor-  
mally used for the other SCSI devices such as this  
Barracuda disc drive.  
Note. MostSCSIcontrollers(hostadapters)allowyouto  
skip a SCSI ID. For example, you can have ID0,  
ID1, and ID3 (skipping ID2). Other controllers do  
not allow this so be sure to refer to your system or  
controller user’s manual for details about its re-  
quirements for proper SCSI device installation.  
Use connector J4 to set the SCSI ID on ST11950N/ND  
and ST12550N/ND drives (Figure 3). Use connector J5  
tosettheSCSI IDon ST11950W/WDand ST12550W/WD  
drives(Figure4).MostBarracuda1and2discdrivesare  
factorysetwiththeSCSIIDsetat0. TochangetheSCSI  
ID, install jumpers on the appropriate pins as shown in  
the illustrations.  
If, after completing the installation process, the drive’s  
LEDdoesnotshowon/offactivitywhenthehostistrying  
to communicate with the drive, a duplicate SCSI ID may  
be the problem. If this is the case, change the ID so that  
each device on the SCSI chain has its own unique ID.  
 
ST11950 and ST12550 Installation Guide, Rev. D 21  
Also check your system or controller user’s manual to  
ensurethatyouhavenotviolateditsSCSIIDnumbering  
recommendations.  
SCSI  
Connector  
DC Power  
Connector  
J01  
Pin 1  
J4  
ID1  
ID2  
ID0  
Select SCSI ID by placing  
jumpers as shown below.  
J4  
SCSI ID = 0  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
Figure 3. Setting the SCSI ID on N- and ND-type drives  
 
22 ST11950 and ST12550 Installation Guide, Rev. D  
SCSI I/O  
Connector  
DC Power  
Connector  
J5 Pin 1  
Pin 1  
4P  
3P 2P  
1P  
ID3 ID1  
ID2 ID0  
J5  
SCSI ID = 0  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
Figure 4. Setting the SCSI ID on W- and WD-type drives  
 
ST11950 and ST12550 Installation Guide, Rev. D 23  
Terminating the drive  
If you are installing the drive in a system that has other  
SCSI devices installed, terminate only the end devices  
on the SCSI chain. A SCSI “device” is any disc drive,  
scanner, tape backup unit, or other piece of hardware  
connected to your system using the SCSI bus.  
The top example in Figure 5 shows an internal hard disc  
atoneendoftheSCSIbuswiththeSCSIcontrolleratthe  
other end (both are terminated). The bottom example  
shows two additional SCSI devices connected exter-  
nally—thismeanstheSCSIcontrollerisnolongeronthe  
end of the SCSI chain and should not be terminated.  
Internal SCSI cable  
Internal  
Internal  
Controller  
SCSI device SCSI device  
Terminate  
Internal SCSI cable  
External  
SCSI  
cable  
Internal  
Internal  
SCSI device SCSI device  
External  
External  
Controller  
SCSI device SCSI device  
Terminate  
Figure 5. SCSI bus termination  
 
24 ST11950 and ST12550 Installation Guide, Rev. D  
Refer to the appropriate section below for instructions in  
terminating a drive.  
Caution. Installing or removing terminator packs im-  
properly can result in damage to the termina-  
tors or surrounding components.  
ST11950N and ST12550N drives  
To terminate ST11950N and ST12550N drives, install  
terminator packs as shown in Figure 6.  
I/O Terminator Packs  
(single-ended I/O only)  
Pin 1 End  
(of terminator)  
Figure 6. Installing terminator packs (ST11950N shown)  
 
ST11950 and ST12550 Installation Guide, Rev. D 25  
Note. All single-ended terminators must be ANSI  
SCSI-2 alternative 2 active terminators.  
To install terminators, carefully insert the terminator’s  
pins firmly into the socket’s holes. Note that pin 1 on the  
pack is identified by a dot, a number one, or a notch.  
To remove termination, remove the terminator packs by  
carefully pulling them out of their sockets.  
ST11950W and ST12550W drives  
ST11950W and ST12550W drives are equipped with  
permanently mounted IC terminators. This means you  
can either enable or disable termination using jumpers  
as described below.  
ToterminateST11950WandST12550Wdrives(enable  
termination), install a jumper on J4 pins 11 and 12 as  
shown in Figure 7.  
To remove termination (disable termination), remove  
the jumper from J4 pins and 11 and 12.  
 
26 ST11950 and ST12550 Installation Guide, Rev. D  
J4  
Pin 1  
J01  
EDT PAR DMS  
RES RES MTR WP  
J4  
Enable Drive Terminators (EDT)  
Enable drive terminators.  
Disable drive terminators.  
Figure 7. Enabling termination  
on ST11950W and ST12550W drives  
ST11950ND/WD and ST12550ND/WD drives  
ST11950ND/WD and ST12550ND/WD drives have no  
provisions for internal termination. To terminate these  
drives, you must provide external termination.  
 
ST11950 and ST12550 Installation Guide, Rev. D 27  
Terminator power  
Single-ended (N and W) drives have four valid configu-  
rations for terminator power (see Figure 8). Differential  
(ND and WD drives) must be configured with a jumper  
on J01 pins 1 and 3 only.  
J01 location on “N” J01 location on “W”  
and “ND” drives  
and “WD” drives  
Pin  
J01  
2
J01  
Pin 1  
Pin 1  
Pin 3  
Pin  
4
Terminator power options.  
These jumpers determine how  
termination is supplied.  
J4  
J4  
* Terminator power from the drive. The  
drive provides its own terminator power.  
* Terminator power from TERMPWR on the  
SCSI bus.  
Terminator power to the SCSI bus. The drive  
supplies power to TERMPWR on the SCSI bus.  
* Terminator power to the SCSI bus and drive.  
* Valid for single-ended (“N” and “W”) drives only.  
Figure 8. Setting terminator power jumpers  
 
28 ST11950 and ST12550 Installation Guide, Rev. D  
Changing other applicable jumper options  
Barracuda 1 and 2 drives are designed to be used in a  
varietyofsystems. Uniqueinstallationsmayrequireyou  
to change one or more of the other jumpers to meet  
specific system requirements; however, in most cases,  
you will not need to change any of these jumpers for  
normal drive operation. Figures 9a and 9b provide the  
information necessary to configure all N and ND drive  
jumpers not discussed elsewhere in this manual.  
SCSI  
Connector  
DC Power  
Connector  
J01  
Pin 1  
J4  
WP RES  
LED  
RES  
J4  
Write Protect option (WP)  
Write Protect = On (disables writing).  
Write Protect = Off  
(enables writing – default).  
Remote LED Connector*  
Pin 5 (top pin in this illustration) is negative,  
Pin 6 (bottom pin) is positive.*  
Reserved (RES)  
Reserved for factory use.  
*Note to subsystem designers: In Europe, a red LED indicates  
an error or warning condition. For this reason, you may want  
to use a color other than red with this connection.  
Figure 9a. Additional jumper options  
for ST11950N/ND and ST12550N/ND drives  
 
ST11950 and ST12550 Installation Guide, Rev. D 29  
SCSI  
Connector  
DC Power  
Connector  
J01  
Pin 1  
J4  
MTR  
PAR DMS  
J4  
Parity Check option (PAR)  
Enable parity check of SCSI bus data  
(default).  
Disable parity check.  
Motor Start option (MTR)  
Enable motor start. This makes the  
drive wait for the Start Unit command  
from the host before starting the  
spindle motor.  
Disable motor start (default). This  
causes the drive to start according to  
the Delay Motor Start option setting as  
described below.  
Delay Motor Start option (DMS)  
(valid only if the Motor Start  
jumper is not connected)  
Motor start delay equal to the SCSI ID  
multiplied by 10 seconds. For example,  
if the SCSI ID = 2, the drive will delay for  
20 seconds before starting.  
Disable the Delay Motor Start option  
(default).  
Figure 9b. Additional jumper options  
for ST11950N/ND and ST12550N/ND drives  
 
30 ST11950 and ST12550 Installation Guide, Rev. D  
Figures 10a and 10b provide the information necessary  
to configure all W and WD drive jumpers not discussed  
elsewhere in this manual.  
SCSI I/O  
Connector  
DC Power  
Connector  
J5 Pin 1  
LED  
J5  
Remote LED Connector*  
Pin 9 (top pin in this illustration) is  
negative (cathode), Pin 10 (bottom pin)  
is positive (anode).  
*Note to subsystem designers: In Europe, a red LED  
indicates an error or warning condition. For this reason, you  
may want to use a color other than red with this connection.  
Figure 10a. Additional jumper options  
for ST11950W/WD and ST12550W/WD drives  
 
ST11950 and ST12550 Installation Guide, Rev. D 31  
J4  
Pin 1  
J01  
RES  
PAR DMS  
RES MTR WP  
J4  
Reserved (RES)  
Reserved for factory use.  
Parity Check option (PAR)  
Enable parity check of SCSI bus data (default).  
Disable parity check of SCSI bus data.  
Motor Start option (MTR)  
Enable motor start. This makes the drive wait  
for the Start Unit command from the host before  
starting the spindle motor.  
Disable motor start (default). This causes the  
drive to start according to the Delay Motor  
Start option setting as described below.  
Delay Motor Start option (DMS)  
(valid only if the Motor Start option  
jumper is not connected)  
Motor start delay equal to the SCSI ID multiplied  
by 10 seconds. For example, if the SCSI ID = 2,  
the drive will delay for 20 seconds before starting.  
Disable the Delay Motor Start option (default).  
Write Protect option (WP)  
Write Protect = On (disables writing).  
Write Protect = Off (enables writing – default).  
Figure 10b. Additional jumper options  
for ST11950W/WD and ST12550W/WD drives  
 
32 ST11950 and ST12550 Installation Guide, Rev. D  
Synchronizing spindles  
If you are installing two or more Barracuda drives, you  
may (optionally) want to synchronize their spindles to  
reduce the latency associated with switching from one  
drive to another. Spindle sync cables are used to con-  
nect the drives.  
For N- and ND-type drives, use pins 1 and 2 on the J4  
connector to attach the spindle sync cable. Pin 1  
provides the reference index signal (REFSIG+) and  
pin 2 provides ground (GND). See Figure 11.  
SCSI  
Connector  
DC Power  
Connector  
J01  
Pin 1  
Pin 2  
J4  
SSC  
Spindle Sync Cable Connector  
(SSC). These pins are used to  
connect a spindle sync cable.  
J4  
Spindle sync reference index signal  
(REFSIG+).  
Ground (GND).  
Figure 11. Spindle sync jumpers and connectors  
for ST11950N/ND and ST12550N/ND drives  
 
ST11950 and ST12550 Installation Guide, Rev. D 33  
For W- and WD-type drives, use pins 11 and 12 on the  
J5 connector to attach the spindle sync cable. Pin 11  
provides the reference index signal (REFSIG+) and pin  
12 provides ground (GND). See Figure 12.  
SCSI I/O  
Connector  
DC Power  
Connector  
J5 Pin 1  
SSC  
Spindle Sync Cable Connector (SSC)  
These pins are used to connect a  
spindle sync cable.  
J5  
Spindle sync reference index signal  
(REFSIG+).  
Ground (GND).  
Figure 12. Spindle sync jumpers and connectors  
for ST11950W/WD and ST12550W/WD drives  
 
34 ST11950 and ST12550 Installation Guide, Rev. D  
Figure 13 illustrates a typical synchronized spindle  
configuration.  
After connecting each drive with spindle sync cables,  
you must designate a master spindle sync reference  
source. This master source is normally a disc drive  
located on the same SCSI bus as the other drives you  
want to synchronize with. To designate a drive as the  
master, use SCSI interface commands. Refer to the  
Product Manual for information about using these  
commands.  
Sync Interface  
Sync Interface  
Master Sync  
Source  
Master Sync  
Source  
J4  
1
J5  
11  
Spindle  
Control  
Spindle  
Control  
Host  
(or other drive)  
Host  
(or other drive)  
2
12  
+5V  
R
Drive 1  
+5V  
R
Drive 1  
T
T
J4  
1
J5  
11  
System  
Interface  
System  
Interface  
Spindle  
Control  
Spindle  
Control  
2
12  
+5V  
+5V  
R
R
T
T
Drive 2  
Drive 2  
J4  
1
J5  
11  
Spindle  
Control  
Spindle  
Control  
2
12  
+5V  
+5V  
R
R
T
T
Drive n  
Drive n  
ST11950N/ND and  
ST12550N/ND Drives  
ST11950W/WD and  
ST12550W/WD Drives  
Figure 13. Spindle sync diagram  
 
ST11950 and ST12550 Installation Guide, Rev. D 35  
Providing adequate cooling  
The enclosure design must ensure adequate cooling  
for the drive. The maximum ambient temperature is  
50oC.  
Thedrive’s product manual(83327780)describeshow  
to evaluatetheair-flowdesign.The evaluation consists  
ofensuringthatthecasetemperaturesofcertaincritical  
components remain within acceptable limits during  
drive operation.  
We recommend orienting the drive or directing the air  
flow in a way that creates the least amount of air-flow  
resistance while providing air flow above the circuit  
boardsand aroundthehead anddisc assembly(HDA).  
Also,choosetheshortest possiblepathbetweentheair  
inlet and exit. This minimizes the distance traveled by  
air that is heated by the drive and by other nearby heat  
sources.  
Figure 14 shows two design approaches with one or  
more fans used to generate air flow. The air-flow pat-  
terns can be created by the fans either pushing or  
drawing air. The overall flow pattern can be directed  
from front to back, back to front, or side to side.  
 
36 ST11950 and ST12550 Installation Guide, Rev. D  
Kühlung des Systems  
Die Gehäusekonstruktion muß eine ausreichende  
Kühlung des Laufwerkes gewährleisten. Die  
Umgebungstemperatur darf maximal 50oC betragen.  
Die Produkthandbuch Barracuda 1 und 2 (Dokument  
83327780) enthalten Anweisungen zur Beurteilung der  
Luftstromkonstruktion.DieBeurteilungmußsicherstellen,  
daß sich die Gehäusetemperatur bestimmter kritischer  
Komponenten bei Laufwerkbetrieb innerhalb  
zugelassener Grenzen hält.  
Wirempfehlen, dasLaufwerksozuorientierenoderden  
Luftstrom so zu lenken, daß der geringste  
Luftstromwiderstand erzeugt wird und gleichzeitig ein  
Luftstrom über den Platinen und um die Kopf- und  
Festplatteneinheit(HDA)gegebenist.WählenSieeinen  
möglichstkurzenWegzwischenLufteinlaßund-auslaß.  
Dadurch wird die Strecke, die die vom Laufwerk und  
anderennahegelegenenHitzequellenaufgewärmteLuft  
zurücklegt, auf ein Minimum beschränkt.  
Abbildung 14 zeigt zwei Konstruktionsmöglichkeiten,  
bei denen ein oder mehrere Lüfter den Luftstrom  
erzeugen. Der Luftstromverlauf wird durch die Lüfter  
gesteuert, die entweder Luft einblasen oder abziehen.  
Generell kann der Luftstrom entweder von vorne nach  
hinten oder von hinten nach vorne verlaufen.  
 
ST11950 and ST12550 Installation Guide, Rev. D 37  
Above unit  
Über der Einheit  
Note. Air flows in the direction shown (back to front)  
or in reverse direction (front to back)  
Under unit  
Unter der Einheit  
Hinweis. Luftstrom in der angezeigten Richtung  
(von vorne nach hinten) oder in umgekehrter  
Richtung (von hinten nach vorne)  
Above unit  
Über der Einheit  
Note. Air flows in the direction shown or  
in reverse direction (side to side)  
Under unit  
Unter der Einheit  
Hinweis. Luftstrom in der angezeigten Richtung oder in  
umgekehrter Richtung (von Seite zu Seite)  
Figure 14. Suggested air flow  
Abbildung 14. Empfohlener Luftstromverlauf  
 
38 ST11950 and ST12550 Installation Guide, Rev. D  
Mounting the drive and connecting cables  
Do not touch the connector pins or any components on  
the control board without observing static-discharge  
precautions. Always handle the drive by the frame only.  
The drive may be mounted in any orientation (horizon-  
tally, vertically, and any combination thereof); however,  
you must ensure that the drive receives adequate air  
flow for cooling.  
1. Mount the drive to the host system’s chassis using  
four 6-32 UNC screws. Two mounting holes are in  
each side of the drive and there are four mounting  
holes in the bottom of the drive. See Figure 15.  
The maximum length that the screws should ex-  
tend into the chassis mounting holes is 0.15 inch  
(3.81 mm), measured from the outer surface of the  
chassis. Tighten the screws down evenly. Do not  
over-tighten or force the screw if it does not seem to  
screw in easily, because this means the threads are  
not properly aligned. In this case, back the screw out  
and try again.  
 
ST11950 and ST12550 Installation Guide, Rev. D 39  
Installation des Laufwerkes  
und Anschluß der Kabel  
Beachten Sie beim Handhaben und Anfassen der  
Anschlußstifte  
und  
Komponenten  
die  
Vorsichtsmaßnahmen zur Verhinderung statischer  
Aufladung. FassenSiedasLaufwerknuramRahmenan.  
Das Laufwerk kann in beliebiger Orientierung (horizon-  
tal, vertikal oder schräg) installiert werden; jedoch muß  
dafür gesorgt werden, daß ein ausreichender Luftstrom  
zur Kühlung des Laufwerkes vorhanden ist.  
1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-  
Schrauben am Gehäuse des Host-Systems. Die  
beiden Seiten des Laufwerkes sind mit jeweils zwei  
Befestigungslöchern versehen, die Unterseite des  
Laufwerkes weist vier weitere Befestigungslöcher  
auf. Siehe Abbildung 15.  
GemessenvonderAußenflächedesGehäusesdürfen  
die Schrauben maximal 3,81 mm in die  
Befestigungslöcher des Gehüuses hineinragen. Die  
Schrauben müssen gleichmäßig, jedoch nicht zu  
fest, angezogen werden. Wenn sich eine Schraube  
nicht ohne Widerstand einschrauben läßt, sind die  
Gewinde nicht korrekt aneinander ausgerichtet. In  
diesem Fall die Schraube nicht in das Gewindeloch  
forcieren, sondern die Schraube herausnehmen und  
erneut in das Gewindeloch einführen.  
 
40 ST11950 and ST12550 Installation Guide, Rev. D  
T
U
(1)  
C
R
(3)  
P
F
N
D
E
K
L
A
M
Notes:  
(1)  
Mounting holes two on each  
side, 6-32 UNC. Max screw  
length into side of drive is  
0.15 in. (3.81 mm).  
B
Mounting holes four on  
bottom, 6-32 UNC. Max  
screw length into bottom of  
drive is 0.15 in. (3.81 mm).  
(2)  
(3)  
(4)  
Power and interface  
connections.  
Decorative front panel.  
(2)  
Inches  
Millimeters  
A
B
C
D
E
F
G
H
J
5.740  
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
0.010 145.80  
0.010 101.60  
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
.25  
4.000  
1.615  
.615  
4.000  
.250  
1.750  
3.750  
2.370  
5.420  
5.565  
5.930  
.240  
.25  
.28  
.50  
.13  
.13  
.25  
.25  
.25  
.50  
.25  
.50  
.38  
.38  
.25  
.25  
.25  
G
0.011  
0.020  
41.02  
15.68  
0.005 101.60  
0.005  
0.010  
0.010  
0.010  
6.35  
44.45  
95.25  
60.20  
K
L
0.020 137.69  
0.010 141.35  
0.020 150.62  
J
M
N
P
R
S
T
0.015  
0.015  
0.010  
6.10  
10.31  
43.82  
.410  
1.725  
4.100  
.190  
0.010 104.14  
0.010 4.83  
H
U
0.015 max  
0.381max  
(4)  
S
Figure 15. Dimensions  
Abbildung 15. Laufwerkabmessungen  
 
ST11950 and ST12550 Installation Guide, Rev. D 41  
2. Verify that all connections between the drive and the  
host system are correctly installed.  
2. Prüfen Sie, ob alle Verbindungen zwischen dem  
Laufwerk und dem Host-System korrekt hergestellt  
sind.  
3. Verify that you have correctly installed SCSI ID jump-  
ers (see Figures 3, 4, 6, and 7).  
3. StellenSiesicher,daßdieKennungsbrückeninstalliert  
sind. Siehe Abbildung 3, 4, 6, und 7.  
4. Connect the 50-pin SCSI cable into the drive’s SCSI  
connector (shown earlier in Figures 3 and 4). Take  
care not to stretch or crimp this cable, and do not  
block the system’s cooling air flow with the cable.  
ThedrivereceivesDCpowerthrougha4-pinconnec-  
tor mounted next to the SCSI connector. The output  
of a power supply must meet SELV (safety extra low  
voltage)asdefinedinIEC950.Figure16providesthe  
pin information for the DC power connector. To con-  
nect the DC power cable to the drive, insert the cable  
end into the drive’s DC power connector.  
4. Schließen Sie das 50-polige SCSI-Kabel an den  
SCSI-SteckverbinderdesLaufwerkesan(wiebereits  
in Abbildung 3 und Abbildung 4 gezeigt). Das Kabel  
 
42 ST11950 and ST12550 Installation Guide, Rev. D  
darf nicht gedehnt oder gedrückt werden und es darf  
den Luftstrom zur Kühlung des Systems nicht  
behindern.  
Das Laufwerk wird über einen 4-poligen, neben dem  
SCSI-Anschluß befestigten Steckverbinder mit  
Gleichstrom versorgt. Der Ausgang eines Netzteils  
muß SELV (safety extra low voltage) nach IEC 950  
entsprechen.Abbildung16zeigtdieSteckerbelegung  
für den Gleichstromanschluß. Zum Anschluß des  
Gleichstromkabels an das Laufwerk das Kabelende  
indenGleichstromanschlußdesLaufwerkesstecken.  
Pin Power  
Pin Gleichstrom  
1
2
3
4
+12V  
1
2
3
4
+12 V  
+12V return  
+ 5V return  
+ 5V  
+12 V Rückleitung  
+ 5 V Rückleitung  
+ 5 V  
4
3
2
1
Figure 16. DC power connector  
Abbildung 16. Gleichstromanschluß  
 
ST11950 and ST12550 Installation Guide, Rev. D 43  
Note. Signal ground on the power control board (PCB)  
and the head and disc assembly (HDA) are con-  
nected together in this drive and you cannot  
separate them. The equipment in which you have  
mounted the drive is connected directly to the  
HDA and PCB without electrically isolating shock  
mounts. Maximizing the conductive contact area  
between HDA ground and system ground may  
reduce radiated emissions. If you do not want the  
system chassis to be connected to the HDA/PCB  
ground, you must provide a nonconductive (elec-  
trically isolating) method of mounting the drive in  
thehostsystem.Thismayincreaseradiatedemis-  
sions and is the system designer’s responsibility.  
Hinweis:  
DieSignalerdeaufderStromregelungskarte(PCB)  
und der Kopf- und Festplatteneinheit (HDA) sind  
in diesem Laufwerk miteinander verbunden und  
können nicht getrennt werden. Das Gerät, in das  
Sie das Laufwerk eingebaut haben, ist ohne  
elektrisch isolierende Stoßdämpfer direkt an die  
HDA und PCB angeschlossen. Die  
elektromagnetische Strahlung kann reduziert  
werden, indem Sie eine möglichst große leitende  
Kontakfläche zwischen der HDA-Erdung und der  
Systemerdung vorsehen. Wenn Sie das  
 
44 ST11950 and ST12550 Installation Guide, Rev. D  
Systemgehäuse nicht an die HDA/PCB-Erdung  
anschließen wollen, müssen Sie das Laufwerk  
auf nichtleitende Weise (galvanisch isoliert) im  
Host-System einbauen. Die daraus u.U.  
resultierende verstärkte elektromagnetische  
Strahlung fällt in den Zuständigkeitsbereich des  
Systemdesigners.  
5. Replace the host system’s cover.  
5. Setzen Sie das Gehäuseoberteil des Host-Systems  
wieder auf.  
 
ST11950 and ST12550 Installation Guide, Rev. D 45  
Formatting the drive  
Warning. Formatting a drive erases all user data. Be  
sure that you understand this principle before  
formatting any hard disc drive.  
It is not necessary to format a drive which has  
previously been used to store data, unless  
your intention is to erase all user data.  
1. Turn on DC power.  
2. Boot the system from a system floppy disc or from a  
previously installed hard disc drive if there is one.  
3. Format the disc drive. The Barracuda 1 and 2 disc  
drives are designed to operate with a variety of  
operating systems; therefore, please refer to your  
system or SCSI controller manuals for information  
about formatting and setting up the drives.  
 
Seagate Technology, Inc.  
920 Disc Drive, Scotts Valley, CA 95066-4544, USA  
Publication Number: 83327770, Rev. D, Printed in USA  
 

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