Seagate ST43400N-ND User Manual

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Elite Disc Drive

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ST43400N/ND

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User ’s Manual

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Contents

Preface .................................................................................................... iii

Electrostatic discharge protection........................................................ iii

Important safety information and precautions...................................... iv

Technical support services.................................................................. vi

Section 1. General description ................................................................ 1

Section 2. Installation .............................................................................. 7

Section 3. Operation ............................................................................... 33

Section 4. Parts data............................................................................... 37

Section 5. Maintenance........................................................................... 39

trademarks of Seagate Technology, Inc. Elite SeaBOARDTM are trademarks of Seagate Technology, Inc. Other product names are registered trademarks or trademarks of their owners.

No part of this publication may be reproduced in any form without written permission from Seagate Technology, Inc.

TM,

SeaFAXTM, SeaFONETM, and

ST43400N/ND User’s Manual iii

Preface

This manual contains information for users of the Seagate ST43400N and ST43400ND Elite disc drives employing the SCSI interface. It provides installation, operation, and maintenance information. This manual also lists the part numbers for options and accessories available for these drives. Additional information is available in the reference manual (publication 83327640).

Electrostatic discharge protection

Caution. Removal of circuit boards by personnel not performing depot repair

will damage components and may void the warranty.

All drive electronic assemblies are sensitive to static electricity, due to the electrostatically sensitive devices used within the drive circuitry. Although some devices such as metal-oxide semiconductors are extremely sensitive, all semiconductors, as well as some resistors 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. To avoid damaging drive electronic assemblies, observe the following precautions when installing or servicing the drive:

• Ground yourself to the drive whenever the drive electronics are or will be exposed. Connect yourself to ground with a wrist strap (refer to accessories in Section 4 for part numbers). 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 circuit boards from the drive.

• Never use an ohmmeter on any circuit boards.

Important safety information and precautions

Caution. Use forced-air ventilation when bench-testing the drive to ensure

proper cooling of drive components.

Use proper safety and repair techniques for safe, reliable operation of this unit. Service should be done only by qualified persons. We recommend the procedures in this 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 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.

You must also understand that 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 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.

Always observe the following warnings and precautions:

• Perform all maintenance by following the procedures in this manual.

• Follow all cautions and warnings in the procedures.

• Use sound safety practices when operating or repairing 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.

• Provide a means to isolate the drive from the main power in case of fire or other emergency.

• 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 special attention 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 chassis. Return the entire drive for depot repair if any circuit board is defective. Removal of circuit boards by personnel not performing depot repair will damage components and may void the warranty.

ST43400N/ND User’s Manual v

• Do not remove the head and disc assembly (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 components 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 VDE0806. Refer to section 2 for information about installation.

If you do not use a Seagate power supply, ensure that the supply meets the specifications in this manual and is designed to be used in accordance with UL1950, IEC950, EN60950, CSA C22.2 950, and VDE0806.

Seagate takes all reasonable steps to ensure that its products are certifiable to currently accepted standards. Typical applications of these disc drives include customer packing and subsystem design. Safety agencies conditionally certify component parts, such as the Elite disc drive, based on their final acceptability in the end-use product. The subsystem designers are responsible for meeting these conditions of acceptability in obtaining safety/regulatory agency compliance 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 requirements as a stand-alone unit. Engineering radiated and conducted emissions test results are available through the Seagate Safety Department to assist the subsystem designer.

Technical support services

Seagate Technology provides technical support literature 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, or SeaBOARD services. These are toll calls if you dial from outside of the number’s local dialing area.

SeaFAX: (408) 438-2620

You can use a Touch-Tone telephone to access Seagate’s automated FAX delivery system and select technical support information by return FAX. This service is available twenty-four hours a day, seven days a week.

SeaFONE: (408) 438-8222

The enhanced phone system provides recorded technical information on selected Seagate products while you are on hold. Technical support specialists are available to answer questions from 8:00 A.M. to 5:00 P.M. PST, Monday through Friday. Recordings are accessible twenty-four hours a day, seven days a week.

SeaBOARD:

The Seagate Technical Support Bulletin Board System (BBS) is available twenty-four hours a day, seven days a week. A modem is required to access this service. The communications software must be set for eight data bits no parity and one stop bit (8N1). With this service you can access:

• Specifications and jumper configurations for all Seagate products

• Reprints of Seagate documentation

• A directory of information and helpful utilities that you can download to your own computer

Location Telephone Number Maximum Baud Rate

United States/Canada (408) 438-8771 9600 England 44-62-847-8011 9600 Germany 49-89-140-9331 2400 Singapore 65-227-2217 9600 Australia 61-2-756-2359 9600

Note. This is a toll call if you dial from outside of the number’s local dialing area.

Section 1. General description

The Seagate ST43400N/ND Elite 3 disc drives are high speed, random access digital data storage devices. They communicate with an initiator using the Small Computer System Interface (SCSI). The drive is shown in Figure 1, and its specifications are listed in Table 1 on the following page.

The drive is a component for installation in an enclosure designed for the drive. The enclosure design must ensure adequate cooling for the drive, and it must address the requirements for grounding and for shielding of emissions. The reference manual (publication 83327640) presents guidelines for designing the enclosure, but the design is your responsibility.

Spindle Sync

Option

Jumpers

I/O

Connector

Head and Disc

Assembly (HDA)

Connector

Option

Jumpers

Pin 1

DC Power Connector

Control

Board

Option

Jumpers

Power

Board

Optional

Bezel

Chassis

Figure 1. The ST43400N/ND disc drive

Table 1. Drive specifications Characteristics Conditions Specifications

Size Dimensions See “Space requirements”

in section 2 Weight (drive only) 3.6 kg (8.0 lb) Weight (power supply only) 2.3 kg (5.0 lb)

Interface Fast SCSI-2 Recording Total capacity 3,554,871,600 bytes

(unformatted) Bytes per track

(unformatted)

Inner track 49,000 bytes Outer track 72,800 bytes

Formatted capacity*

(256-byte sectors) 2,538,290,688 bytes (512-byte sectors) 2,916,687,360 bytes

(1,024-byte sectors) 3,150,686,208 bytes Number of discs 11 Recording heads 21 Servo heads 1 Physical heads per surface 1 Cylinders per head/disc assy 2,738 (includes 2 spares) Cylinders available to user 2,736 Spare cylinders 1 System cylinders 1 Diagnostic cylinders 1 Spare sectors per cylinder 6 Modulation 1,7 code

* Excluding spare sectors, spare cylinders, diagnostic cylinders, and system cylin-

ders.

continued

General description 3

continued from previous page

Characteristics Conditions Specifications

SCSI transfer rate, burst 10.0 Mbytes/sec max Seek time

(time required to move heads to a different track address— excluding SCSI I/O overhead)

Typical full 23.5 msec Typical average 11.5 msec Typical one-track 1.7 msec

Typical access times Write Read

Typical single track seek msec 1.7 0.9

Average seek msec 11.5 10.5 Maximum seek msec 23.5 22.5

Latency (time required to reach a particular track address after head positioning is complete)

Average 5.55 msec

(disc rotation at 5400 RPM)

Maximum 11.17 msec

(disc rotation at 5373 RPM)

Start time** 30 sec max Stop time 30 sec max

** Following the power sequence delay, once DC power is applied and start

conditions are present.

The drive contains all the circuits and mechanical devices necessary to record data on and recover it from its discs. The drive requires DC voltage input from an external power supply, which receives its AC input power from the site main power source. A power supply and DC power cable are available accessories.

The drive consists of a head and disc assembly (HDA) and two circuit boards, mounted on a common chassis. The circuit boards contain the electronics required for drive operation. The HDA is a sealed unit containing the electromechanical components used for data retrieval and storage. These components include the discs, spindle, drive motor, actuator, heads, and preamplifiers.

The 11 discs provide the recording medium for the drive. These discs are mounted on a spindle, and the spindle is coupled directly to the drive motor. The drive motor rotates the discs at 5400 RPM and produces a circulation of air within the sealed HDA.

The built-in SCSI controller directs all drive functions, receives commands from the initiator (host computer), interprets them, and then transfers the necessary commands to the drive. The controller therefore allows the initiator to start an operation and then disconnect to service another device. Refer to the reference manual for a description of interface functions.

All drive operations are related to data recovery and storage (normally referred to as reading and writing). The actual reading and writing is performed by heads that are positioned over the rotating discs’ recording surfaces. There is one head for each data surface. The heads are positioned in such a way that data is written in concentric tracks around the disc surfaces (see Figure 2).

Before any read or write operation can be performed, the controller must instruct the drive to position the heads over the desired cylinder (called seeking) and to use the head located over the surface (head selection) where the operation is to be performed.

The heads are mounted on the actuator, and the actuator moves the heads over the rotating discs. There are 22 heads; a servo head to sense actuator positioning and 21 data heads used for data transfers to and from the discs. The actuator has a voice coil that moves in a permanent magnetic field in response to signals from the servo positioning circuitry. The voice coil moves the heads in an arc across the rotating discs.

When the drive is not powered on, the heads rest on the disc surface in a preassigned landing zone located beyond the data zone. The actuator automatically latches in this position to protect the drive in the event that it is moved or shipped. When the drive is activated to bring the discs up to speed, the heads fly on a cushion of air close to the disc surface.

General description 5

Data recorded in concentric tracks

Head

Selection

Logic

Heads

Discs

Power Supply

Initiator

I/0 Lines

SCSI

Controller

Unit

Selection

Logic

Read/Write

Logic

Seek Logic

Track

Orientation

Logic

Error

Detection

Logic

Figure 2. Drive functional block diagram

After arriving at the data track and selecting a head, the controller locates the portion of the track where the data is to be read or written. This is called track orientation. Signals from the drive indicate the beginning of each track. The controller uses these signals to determine the position of the head on the track.

When the head is above the desired track location, the controller commands the drive to actually read or write the data. During a read operation, the drive retrieves data from the discs, processes it, and transmits it to the controller. During a write operation, the drive receives data from the controller, processes it, and stores it on the discs.

The drive can also recognize certain errors that may occur during its operation. When an error is detected, it is indicated to the initiator by the SCSI controller.

Section 2. Installation

The information contained in this section describes installation and initial checkout of the drive.

Site requirements

The site requirements considered are environment, airflow, space, power, grounding, and interface.

Environmental requirements

All environmental requirements for the drive are listed in Table 2 below.

Table 2. Drive environmental requirements Conditions Specifications

Operating environment

Temperature Range of 5

maximum change of 20oC (36oF) per hour

Humidity Range of 5% to 95% relative

A maximum wet bulb temperature of 26 no condensation

Barometric pressure -305 m to 3,048 m (-1,000 ft to 10,000 ft);

104 kPa to 69 kPa (30 in Hg to 20 in Hg)

C to 50oC (41oF to 122oF) with a

C (79oF)

Non-operating environment (unpacked)

Temperature Range of -40oC to 60oC (-40oF to 140oF) with a

maximum change of 20oC (36oF) per hour

Humidity Range of 5% to 95% relative

A maximum wet bulb temperature of 26 no condensation

Barometric pressure -305 m to 12,192 m (-1,000 ft to 40,000 ft);

104 kPa to 19 kPa (30 in Hg to 6 in Hg)

Storage/transit environment (packed)

Temperature Range of -40

C to 60oC (-40oF to 140oF) with a

maximum change of 20oC (36oF) per hour Humidity Range of 5% to 95% relative Barometric pressure -305 m to 12,192 m (-1,000 ft to 40,000 ft);

104 kPa to 19 kPa (30 in Hg to 6 in Hg)

C (79oF)

Airflow requirements

The enclosure design must ensure adequate cooling for the drive. Note that the fan in the power supply cools only the power supply’s internal parts.

The drive’s product specification (document 64403601) describes how to evaluate the airflow design. The evaluation consists of ensuring that the case temperatures of certain critical components remain within acceptable limits during drive operation.

We recommend orienting the drive or directing the airflow in a way that creates the least amount of airflow resistance while providing airflow above the circuit boards and around the head and disc assembly (HDA). Also, choose the shortest possible path between the air inlet and exit. This minimizes the distance traveled by air that is heated by the drive and by other nearby heat sources.

Figure 3 shows two design approaches with one or more fans used to generate air flow. The airflow patterns 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.

Installation 9

Above unit

Note. Air flow in the direction shown (front to back) or in reverse direction (back to front)

Note. Air flow in the direction shown or in reverse direction (side to side)

Under unit

Above unit

Under unit

Figure 3. Suggested airflow

Space requirements

The drive is designed to be mounted in one of the three orientations shown in Figure 4. The drive may be mounted on its base or on either side. Mounting orientations other than those shown are not permitted. The physical dimensions of the drive and power supply are shown in Figure 5. The drive itself weighs 3.6 kg (8.0 lb).

For details about designing an enclosure to match the drive mounting dimensions, refer to the drive’s product specification.

Figure 4. Mounting orientations

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