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BARRACUDA 1 and 2
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Disc Drive
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ST11950N/ND/W/WD
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ST12550N/ND/W/WD
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Installation Guide
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Contents Preface .................................................................. 1 Electrostatic discharge protection ........................... 1 Important safety information and precautions ......... 2 Wichtige Sicherheitshinweise ............................... 5 Technical support services ..................................... 10 General description ................................................ 12 Initial setup information ........................................... 19 Kühlung des Syst
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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 provides support services, performance specifications, and initial setup information. Additional information is available in the Barracuda 1 and 2 Product Manual (part number 83327780). Contact your Seagate sales rep- resentative if you need to order this publication. Electrostatic discharge pro
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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). Connection may be made to any grounded metal assembly. As a general rule, remember that you and the drive electronics must all be grounded to avoid potentially damaging static discharges. • Turn off the power before removing or installing the DC power cable. • Do not remove any circui
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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 practices that may endanger you or others. The cautions point out conditions or practices that may damage the unit, possibly making it unsafe for use. These warnings and cautions are not exhaustive. We cannot possibly know, evaluate, and advise you of all the ways in which maintenance might be performed or the possible risk of each techniqu
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4 ST11950 and ST12550 Installation Guide, Rev. D • Ensure that the internal temperature of the rack or cabinet does not exceed the limits defined for the drive when the drive is mounted in an equipment rack or cabinet. When units are stacked vertically, pay atten- tion to the top where temperatures are usually highest. • Follow the precautions listed above in “Electrostatic discharge protection.” • Do not remove any circuit boards from the drive chas- sis. Return the entire drive for depot repai
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ST11950 and ST12550 Installation Guide, Rev. D 5 dards. Typical applications of these disc drives include customer packaging and subsystem design. Safety agencies conditionally certify component parts, such as the Barracuda disc drive, based on their final accept- ability in the end-use product. The subsystem designers are responsible for meeting these conditions of accept- ability in obtaining safety/regulatory agency compliance in their end-use products and for certifying where required by law
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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 Vorsichtshinw
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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 ein
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8 ST11950 and ST12550 Installation Guide, Rev. D • Befolgen Sie die oben unter “Electrostatic Discharge Protection” angegebenen Sicherheitsmaßnahmen. • Nehmen Sie keine Platinen aus dem Laufwerkgehäuse. Wenn eine Platine defekt ist, muß das gesamte Laufwerk zur Reparatur eingeschickt werden. Die Herausnahme von Platinen durch anderePersonen als die für die werkseitige Reparatur zuständigen kann zu einer Beschädigung der Komponenten und Erlöschen des Garantieanspruchs führen. • Die vormontierte
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ST11950 and ST12550 Installation Guide, Rev. D 9 geltenden Standards zu gewährleisten. Zu den typischen Anwendungen dieser Festplattenwerke zählen Systemeinbau durch den Kunden und die Konstruktion von Untersystemen. Sicherheitsbehörden gewähren eine bedingte Zulassung für Komponenten wie das Barra- cuda-Festplattenlaufwerk vorbehaltlich der endgültigen Zulasssung im Endprodukt. Designer von Untersystemen sind dafür verantwortlich, die Voraussetzungen für die Einhaltung sicherheits- oder aufsic
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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. Product technical support 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)
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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 pro
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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 in Figure 1, and the ST11950W/WD and ST12550W/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
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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 J01 J5 J4 DC Power
Connector Figure 2. Barracuda 1 and 2 disc drive (W/WD type)
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14 ST11950 and ST12550 Installation Guide, Rev. D Characteristics ST11950N/ND ST11950W/WD 1 1 Interface Fast SCSI-2 Fast & Wide SCSI-2 Multi-seg. cache 1,024 Kbytes 1,024 Kbytes (W) 512 Kbytes (WD) Capacity Unformatted 2,030 Mbytes 2,030 Mbytes 2 Formatted 1,690 Mbytes 1,690 Mbytes Recording Cylinders (user) 2,706 2,706 Heads 15 15 Avg sectors/track 81 (51h) 81 (51h) Avg bytes/track 49,768 49,768 Modulation RLL 1,7 code RLL 1,7 code SCSI rate Max burst transfer 10 Mbytes/sec 20 Mbytes/sec 3 Seek
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ST11950 and ST12550 Installation Guide, Rev. D 15 Characteristics ST12550N/ND ST12550W/WD 1 1 Interface Fast SCSI-2 Fast & Wide SCSI-2 Multi-seg. cache 1,024 Kbytes 1,024 Kbytes (W) 512 Kbytes (WD) Capacity Unformatted 2,572 Mbytes 2,572 Mbytes 2 Formatted 2,139 Mbytes 2,139 Mbytes Recording Cylinders (user) 2,707 2,707 Heads 19 19 Avg sectors/track 81 (51h) 81 (51h) Avg bytes/track 49,768 49,768 Modulation RLL 1,7 code RLL 1,7 code SCSI rate Max burst transfer 10 Mbytes/sec 20 Mbytes/sec 3 Seek
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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 5 2 2 Voltage regulation ± ± ± 5% ± ± ± 5% ± ± ± 5% ± ± ± 5% ± ± ± ± ± ± ± ± Amps 1 Maximum operating current 1.1 0.95 1.5 0.95 1, 12 Average idle current 0.76 0.83 0.79 0.83 Maximum starting current 3, 6 Peak DC 1.0 2.18 1.1 2.18 3 Peak AC - 3.1 - 3.1 1, 4 Delayed motor start (max) 1.06 0.19 1.1 0.2 Peak operat
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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 5 2 2 Voltage regulation ± ± ± 5% ± ± ± 5% ± ± ± 5% ± ± ± 5% ± ± ± ± ± ± ± ± Amps 1 Maximum operating current 1.04 0.95 1.3 0.95 1, 12 Average idle current 0.76 0.83 0.83 0.83 Maximum starting current 3, 6 Peak DC 1.0 2.18 1.1 2.18 3 Peak AC - 3.1 - 3.1 1, 4 Delayed motor start (max) 1.0 0.19 1.1 0.19 Peak opera
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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 7,200 RPM. 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 dri
