LaCie KY0730482 Technical Information, User Advice When Using Scsi, Power Save, Scsi basics

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LaCie d2 SCSI Hard Drive

Technical Information

 

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5. Technical Information

5.1 User Advice When Using SCSI

The following technical information relates to your LaCie Hard Drive and gives some practical advice:

Power Save

The LaCie Hard Drive manages power consumption. If the system’s power save feature supports it, the drive

will spin down during the power save mode. When the system comes out of power save, the drive will take a few seconds to spin up to full power before it can be accessed.

Multiple SCSI Devices

External devices must be powered on before booting the computer — even if they are not to be used. They MUST be left on until the computer has been shut down.

SCSI basics

This section provides a brief description of the SCSI technology and lays down a few basic rules for using SCSI peripherals as stand-alone devices or in a chain.

There are two main categories of SCSI: Narrow SCSI and Wide SCSI.

Narrow SCSI – This is the term used for 8-bit SCSI. You can connect up to 7 peripherals on a narrow SCSI bus. Narrow SCSI peripherals have either 25 or 50 pin connectors.

Wide SCSI – This is the term used to describe 16-bit SCSI. Wide SCSI allows you to connect up to 15 peripherals on a bus, and also offers higher data transfer rates than narrow SCSI. Wide SCSI peripherals almost always feature 68-pin connectors.

There are three types of SCSI devices on the market today, which are defined by the signaling method (the way the signal is transferred over the SCSI bus): SE, HVD and LVD.

SE (Single-ended) – The most common SCSI interface in use today. Single-ended uses half of the cable wires for data/control and the other half as a common ground point. Its advantages include its low cost, and suitability for a wide variety of applications, including hard drives, CD and DVD drives, as well as scanners and printers. LaCie Narrow hard drives are single-ended.

HVD (High Voltage Differential) – HVD has three main advantages over SE: It is possible to have longer overall bus lengths [up to 25 meters (m)], higher data transfer rates and more devices per bus. However, HVD is a much more costly solution, is not as widely deployed as SE and is a fading technology since the advent of Low Voltage Differential.

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Contents Contents Toolbar How to Use This ManualPrinting To ExitTrademarks CopyrightsChanges Canada Compliance StatementWarranty PrecautionsIntroduction Icons Used in This ManualManual Updates What is SCSI?Mac Users Using Mac OS 8.6 LaCie Storage Utilities SoftwarePC Users Using Windows 98 Second Edition SE and Windows Me PC Users Using Windows 2000 and Windows XPMinimum System Requirements Getting To Know Your LaCie Hard DriveLaCie Scsi Hard Drive Views Front ViewSide View Back ViewAttaching the Drive Stand Scsi Cables and ConnectorsConnecting the Power Supply Setting Up Your LaCie Hard DriveConnecting the AC Adapter to the Hard Drive Disconnecting the AC Adapter From the Hard DriveScsi Card Verification Mac Users Installing Your LaCie Hard DriveSetting the Scsi ID Number Drive Recognition Mac Users Software Installation Mac UsersLaCie d2 Scsi Hard Drive Setting Up Your LaCie Hard Drive PC Users Formatting and Partitioning Your LaCie Hard DriveMac Users FAT32 Page Power Save User Advice When Using ScsiTechnical Information Multiple Scsi DevicesCategory ConnectorsScsi types Transfer rateFAT FAT 32 vs. NtfsMac OS Standard Mac OS Standard vs. Mac OS ExtendedGuidelines for Choosing FAT 32 or Ntfs Guidelines for Choosing Mac OS Standard or Mac OS Extended Mac OS ExtendedProblem Questions to Ask Possible Solutions TroubleshootingPossible Solutions Problem Questions to AskMore details Is the Scsi card driver installed correctly and enabled? Technical Support Help Hours Contacting Customer SupportBefore You Call Technical Support Australia Belgium CanadaUnited Kingdom & Ireland Italy Japan NetherlandsSpain Sweden, Norway, and Finland Switzerland Warranty Appendix 1 Scsi Questions and Answers LaCie d2 Scsi Hard Drive Appendix Scsi Q & a Should I use passive or active terminators? What is termination?Where should I place the terminator? LaCie d2 Scsi Hard Drive Appendix Scsi Q & a Glossary LaCie d2 Scsi Hard Drive Glossary General Use Precautions Health and Safety Precautions