Scsi IDs

Overview

Each device attached to the Adaptec SCSI Card 39160, as well as the Adaptec SCSI Card 39160 itself, must be assigned a unique SCSI ID number from 0 to 15 for each of the two SCSI buses. A SCSI ID uniquely identifies each SCSI device on the SCSI bus and determines priority when two or more devices are trying to use the SCSI bus at the same time.

Refer to the device’s documentation to set the SCSI ID. Here are some general guidelines for SCSI IDs:

■For internal SCSI devices, the SCSI ID usually is set by config- uring a jumper on the device.

■For external SCSI devices, the SCSI ID usually is set with a switch on the back of the device.

■SCSI ID numbers do not need to be sequential, as long as the Adaptec SCSI Card 39160 and each device has a different num- ber. For example, on each of the two SCSI buses you can have an internal SCSI device with ID 0, and an external SCSI device with ID 6.

■SCSI ID 7 has the highest priority on the SCSI bus. The priority of the remaining IDs, in descending order, is 6 to 0, then 15 to 8.

■On both SCSI buses (channels) the Adaptec SCSI Card 39160 is preset to SCSI ID 7 and should not be changed. This gives the card the highest priority on the SCSI bus.

■Most internal SCSI hard disk drives come from the factory pre- set to SCSI ID 0.

■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.

■If you are booting your computer from a SCSI hard disk drive connected to the Adaptec SCSI Card 39160, the Boot SCSI 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.

■In Windows® 95/98, you can use the Device Manager to deter- mine which SCSI ID is assigned to each installed SCSI device.