Adaptec 29320A-R User Guide - Page 157

Adaptec Ultra320 SCSI Cards User's Guide What if I have devices that are showing up at the wrong speed (usually slower) when the BIOS scans the SCSI bus during boot? s Make sure you are using the terminated cable supplied with your Adaptec kit. s Do not mix Ultra320/Ultra160 devices and any other speed devices on the same SCSI cable. All Ultra320/Ultra160 devices need to be on a single cable. Adding a slower device will slow down all the devices on the same cable. s Be sure you have the connection firmly seated. A bad connection on a disk drive or other devices can cause problems talking to that device at the maximum speed. s Try to route the cable inside the system as smoothly as possible. Avoid bending, flexing, or stretching the cable inside your system. s If you are not booting from the SCSI card (your boot hard disk drive is not attached to the card) then the BIOS on the card should be disabled. s If the card driver will not load and you do not have your boot hard disk drive attached to the card, try removing all the cables and devices from the card then starting up. If this is successful and the driver loads, then you may have a problem with a device setting (conflicting SCSI ID numbers or Termination setting) or you have a bad cable or cable connection. Reattach devices one at a time until the problem is isolated, remembering to follow the correct termination procedure for the SCSI bus. For more information on termination, see Terminating the SCSI Bus on page 1-9. A-4