
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
There are two main categories of SCSI: Narrow SCSI and Wide SCSI.
Narrow SCSI – This is the term used for
Wide SCSI – This is the term used to describe
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
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.