Adaptec 19160 User Reference - Page 9

Overview s If you have 8-bit (or Narrow) SCSI devices, they must use SCSI IDs 0, 1, 2, 3, 4, 5, or 6. SCSI ID 0 is recommended for the first SCSI hard disk drive. s If you are booting your computer from a SCSI hard disk drive connected to the Adaptec SCSI Card 19160, the Boot Target ID setting in the SCSISelect utility must correspond to the SCSI ID of the device from which you are booting. By default, the Boot SCSI ID is set to 0. We recommend that you do not change this setting. s You can view or confirm SCSI ID assignments using the SCSISelect disk utility. See Configuring the Adaptec SCSI Card 19160 with SCSISelect on page 17. s In Windows® 95/98, you can use the Device Manager to view which SCSI ID is assigned to each installed SCSI device. Terminating the SCSI Bus To ensure reliable communication on the SCSI bus, the ends of the SCSI bus must be properly terminated. This is accomplished when the device at the end of each cable, or the end of the cable itself, has a terminator installed (or enabled). Terminators must be removed, or termination must be disabled, on devices between the ends of each cable. Since the method for terminating a SCSI device can vary widely, refer to the device's documentation for instructions on how to enable or disable termination. Here are some general guidelines for termination: s Internal Ultra160 and Ultra2 SCSI devices come from the factory with termination disabled and cannot be changed. Proper termination for internal Ultra160 and Ultra2 SCSI devices is provided by a 68-pin Internal LVD (Low Voltage Differential) SCSI cable, which either has a built-in terminator at its end, or has a terminator installed on the last connector on the cable. s Termination on non-Ultra160 and Ultra2 internal SCSI devices usually is controlled by manually setting a jumper or a switch on the device, or by physically removing or installing one or more resistor modules on the device. 3