Are Ultra160 SCSI drives compatible with my Ultra2 LVD, Wide SCSI, and High Voltage Differential devices?
Ultra160 SCSI is fully compatible with the existing installed LVD and single-ended SCSI base, SCSI-2 and later. A unique DiffSens circuit determines the type of SCSI bus the device is being used on, LVD or single-ended, and configures the drive operation to the appropriate bus capability (i.e., multi-moding). Ultra160 SCSI is a subset of the SCSI-3 standard. Ultra160 and Ultra2 LVD devices can operate at their respective maximum data transfer speeds simultaneously on the same bus segment. Ultra160 LVD devices will work on SCSI-2 LVD and single-ended bus segments. Conversely, legacy SCSI-1 and SCSI-2 single-ended devices will work on an LVD bus. Compatibility is an important SCSI feature, but when using SCSI devices of different vintage on the same SCSI bus, all peripherals on that bus will respond to the earliest version SCSI specification. If an Ultra device is installed on an LVD bus, all devices on the bus will respond at Ultra mode. HVD devices require a special controller and are
