1-9Introduction On both SCSI buses (channels) the Adaptec SCSI Card is presetto SCSI ID 7 and should not be changed. This gives the card thehighest priority on the SCSI bus. Most internal SCSI hard disk drives come from the factorypreset to SCSI ID 0. If you have 8-bit (or Narrow) SCSI devices, they must use SCSIIDs 0, 1, 2, 3, 4, 5, or 6. SCSI ID 0 is recommended for the firstSCSI hard disk drive. If you are booting your computer from a SCSI hard disk driveconnected to the Adaptec SCSI Card, the Boot SCSI ID setting inthe SCSISelect utility must correspond to the SCSI ID of thedevice from which you are booting. By default, the Boot SCSI IDis set to 0. We recommend that you do not change this setting. With the SCSISelect disk utility feature, you can confirm/viewwhich SCSI ID is assigned to each device. See Chapter 3,Configuring the Adaptec SCSI Card with SCSISelect for moreinformation.Terminating the SCSI BusTo ensure reliable communication on the SCSI bus, the ends of theSCSI bus must be properly terminated. This is accomplished whenthe device at the end of each cable, or the end of the cable itself, hasa terminator installed (or enabled). Terminators must be removed,or termination must be disabled, on devices between the ends ofeach cable.Since the method for terminating a SCSI device can vary widely,refer to the device’s documentation for instructions on how toenable or disable termination. Here are some general guidelines fortermination: Internal Ultra320/Ultra160 and Ultra2 SCSI LVD devices comefrom the factory with termination disabled and cannot bechanged. Proper termination for these internal devices isprovided by the built-in terminator at the end of the 68-pininternal LVD SCSI cable.
