LVD stands for Low Voltage Differential (sometimes called Multi-Mode LVD).
Similar to Differential (HVD), in that two lines (a "+" and "-" signal) are used to define any given signal, LVD is different than High Voltage Differential in two respects: LVD uses lower voltage levels than HVD, and LVD devices can operate on a Single-Ended bus and Vice Versa. However, the presence of any Single-Ended device on an LVD cable will force all devices on that cable to operate in Single-Ended mode. HVD SCSI devices cannot be used on the same SCSI cable with either Single-Ended or LVD devices and require the use of a HVD SCSI controller.
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