Seagate ST39102LW/LC, ST34502LW/LC manual Drive termination

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Cheetah 9LP Installation Guide, Rev. B

Drive termination

If you are installing a Cheetah 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 sys- tem using the SCSI bus.

Note. Use active (ANSI SCSI-2 Alternative 2) single-ended ter- minators when terminating a bus operating in single- ended mode. Use SPI-2-compliant active low voltage dif- ferential terminators when terminating a SCSI Ultra2 bus operating in LVD mode.

The top example in Figure 2 shows an internal hard disc at one end of the SCSI bus with the SCSI controller at the other end (both are terminated). The bottom example shows two additional SCSI devices connected externally—this means the SCSI con- troller is no longer on the end of the SCSI chain and should not be terminated.

Note. Some controllers prefer to remain terminated even if they are in the middle of the chain. Also, some controllers treat the internal and external chains as separate logical buses. This means you may need to terminate both the first and last devices on both logical buses to achieve proper termination. If necessary, refer to your system or controller documentation to see how this is handled in your particular system.

These drives do not have on-board terminators, so you must ter- minate external to the drive when termination is required. For ST39102LC and ST34502LC drives, this is normally accom-

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Contents Disc Drive Contents Preface Electrostatic discharge protectionImportant safety information and precautions Page Wichtige Sicherheitshinweise Page Cheetah 9LP Installation Guide, Rev. B Regulatory agency compliance Electromagnetic susceptibilityElectromagnetic compliance for the European Union Seagate Technology support services Online services SeaBOARDFAX services SeaFAXDirect-support services Technical supportCustomer service centers SA DE CV General description Cheetah 9LP family drive LW model shown Characteristics ST39102LW/LC ST34502LW/LC +12 Drive models General informationSingle-ended and low voltage differential modes Scsi ID jumpersPage Drive termination Terminator power Circuits and data path widthsCable characteristics for SE and LVD circuits Pin I/O connection to drive LW model Multiple-drive connection to host adapter Drive model LC with single 80-pin I/O and power connector Providing adequate cooling Kühlung des Systems Suggested air flow Abbildung 7. Empfohlener Luftstromverlauf Mounting the drive and connecting cables Installation des Laufwerkes und Anschluß der KabelCheetah 9LP Installation Guide, Rev. B DC power connector Abbildung 8. Gleichstromanschluß Hinweis Page Mounting configuration dimensions LW model Mounting configuration dimensions LC model Formatting the drive Quick reference desktop system notesPage Setting the Scsi ID jumpers LW drivesTerminating the drive Setting terminator power jumpers Other applicable jumper options Several other jumper options are available as illustratedAlternate ID select and LED connection Drive Active indicator Drive Active LED indicator connections are shown belowLC drives Terminating the drive Other option jumpers are available as illustrated below Drive Active indicator

ST39102LW/LC, ST34502LW/LC specifications

The Seagate ST34502LW/LC and ST39102LW/LC are part of Seagate's esteemed range of hard disk drives, designed primarily for enterprise applications where reliability, performance, and scalability are paramount. These drives belong to the 7200 RPM class, providing a blend of speed and efficiency that facilitates high-throughput data processing necessary for demanding workloads.

One of the key features of the Seagate ST34502LW/LC and ST39102LW/LC is their storage capacity. The ST34502LW/LC offers a capacity of 4.5 GB, while the ST39102LW/LC comes with a slightly larger capacity of 9.1 GB. This substantial storage capability allows businesses to manage vast amounts of data effectively, fitting seamlessly into storage arrays and servers that require large data management systems.

Both models utilize the SCSI interface, which is widely recognized for its robustness and reliability in enterprise environments. The SCSI interface provides a high-speed data transfer rate, ensuring that data can be accessed and processed quickly. These drives are also designed with an average seek time of 9.0 milliseconds, ensuring efficient retrieval of data.

Another significant characteristic of the Seagate ST34502LW/LC and ST39102LW/LC is their advanced error recovery features. They are equipped with Seagate's Adaptive Fault Tolerance and Error Correction Codes (ECC), which helps to minimize data loss and enhance data integrity. This added layer of protection is essential for mission-critical applications where data accuracy is non-negotiable.

The drives feature a 3.5-inch form factor, making them suitable for a wide variety of enterprise chassis configurations. Their design incorporates a low power consumption mode, which is crucial for data centers aiming to reduce energy costs and improve overall efficiency. The drives are also subject to rigorous testing to ensure they meet Seagate's high reliability standards, making them a trusted choice for data centers and businesses.

In summary, the Seagate ST34502LW/LC and ST39102LW/LC hard drives are designed to meet the demanding requirements of enterprise environments. With robust capacities, reliable performance, and advanced features, these drives represent a solid investment for organizations looking to enhance their data storage capabilities while ensuring operational efficiency. Their reliability and efficiency make them an ideal choice for various applications, from high-performance computing to large-scale storage solutions.
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