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Barracuda 50 Installation Guide, Rev. A 11
Single-ended and low voltage differential modes
This drive incorporates two different transceivers to allow you to
use it in systems which use single-ended (SE) drivers and
receivers, or in low voltage differential (LVD) capable systems
which use LVD drivers and receivers.
You can configure the drive to switch between SE and LVD
modes automatically or force it to operate in SE mode only. To
configure this option, use the jumper illustration on page 24 (LW
models) or page 34 (LC models).
Note.
To operate at the Ultra2 SCSI rates in LVD mode, all
devices on the same bus must be running in LVD mode. If
you add any single-ended device to a bus that is operat-
ing in LVD mode, all devices drop back to operating in
single-ended mode. This eliminates the possibility of
reaching Ultra2 SCSI transfer rates.
The primary benefits of LVD technology
• Faster transfer rates.
• Reduces power consumption.
• Increases allowable cable lengths.
• Improves device connectivity.
Caution.
Do not mix LVD drives on the same bus with
devices having high voltage differential (HVD) interface
circuits. The circuits are not compatible and drive dam-
age may occur.