The ATTO EPCI-DC SCSI HBA is an ultra wide SCSI card. Therefore, all wide drives will work with the ATTO EPCI-DC HBA. Narrow SCSI drives will also work, if used, they should be the last devices of a wide SCSI bus. Note: A terminating adapter should be used between the last wide device and the first narrow device. The adapter must terminate the unused signal lines of the wide bus.Low Voltage Differential drives are wide drives that are compatible with single ended Ultra HBAs like the EPCI-DC. However, you will have to keep total cable length on each bus to less than three meters, since the EPCI-DC is a single ended HBA.