Using the Adaptec configuration utility:
Configure each SCSI device to have a unique SCSI ID. On the Advanced Configuration Options menu, set Plug N Play SCAM Support to Disabled.
Ensure that devices on either end of the SCSI chain are terminated. When mixing wide (16 bits) and narrow (8 bits) devices on the same wide chain, ensure that a wide device is at the end of the chain. If a narrow device is placed at the end of the chain, the wide devices on the same chain only have the low byte terminated, and this is an illegal configuration.
If there is more than one controller (or an embedded controller), try to use one IRQ per controller.
Enable bus mastering for the slot(s) with your host bus adapter(s), when asked.
For older disk drives, tape drives, and most CD-ROM devices, make sure the maximum SCSI data transfer speed is set to 5.0 Mbps.
Enable support for disks larger than 1 Gbyte if applicable.