Firstly, verify that you are using the correct driver and driver name for your Adaptec SCSI Host Adapters. One of the most common issues encountered is that the driver being selected is incorrect for the particular host adapter being used. An example of this would be choosing an 'Ultra2' or 'U2' driver instead of one such as an 'Ultra' SCSI or SCSI card for an AHA-2940UW host adapter.

1. Adaptec Aha-2940uw Pci Scsi Controller Drivers
2. Adaptec Aha-2940uw Pci Scsi Controller Driver Free
3. Adaptec Aha-2940uw Pci Scsi Controller Driver Windows 10
4. Adaptec Aha-2940u/2940uw/2940d Pci Scsi Controller Driver

Adaptec AHA-2940UW Pro PCI SCSI Controller. Download drivers for Adaptec devices for free. Operating System Versions: Windows XP, 7, 8, 8.1, 10 (x64, x86). The Adaptec AHA®-2940 and AHA-2940W PCI-to-Fast SCSI host adapters provide a powerful multi-tasking interface between your computer’s PCI bus and SCSI devices (disk drives, CD-ROM drives, scanners, tape backups, removable media drives, etc.). Collectively, both host adapters are referred to as the AHA-2940/2940W. The following figures. Adaptec 19160, 29160(N), 39160, AHA-3960D, AIC-7892/7899 Ultra160 PCI SCSI Controller(NT 4.0) Adaptec AIC-7870 PCI SCSI Controller Adaptec AHA-2940/AHA-2940W PCI SCSI Controller. Adaptec AHA-2940U/2940UW/2940D PCI SCSI Controller uses the latest version device drivers that are identified as 5.1.2600. This version of device drivers is highly compatible with the Adaptec AHA-2940U/2940UW/2940D PCI SCSI Controller and makes it work more easily and in a better way.

If you are using the 'Have Disk' option under the 'Drivers' tab and point Windows NT to your download, you may see the following list of host adapters:
'Adaptec AHA290x/291x/294x/394x/4944/AIC78xx PCI SCSI Controller(NT 4.0)'

Adaptec Aha-2940uw Pci Scsi Controller Drivers

'Adaptec AHA-294xU2/295xU2/395xU2/AIC-789x PCI SCSI Controller(NT 4.0)'
Select the top option or the 'Adaptec AHA290x/291x/294x/394x/4944/AIC78xx PCI SCSI Controller(NT 4.0)' for the 294x family of host adapters. You'll only want to choose the second listing if your host adapter is either an Ultra 2 controller such as the AHA-2940U2W.
Keep in mind, that 'Ultra' and 'Ultra2' are not the same architecture or technology. They both have their own unique drivers and they must be used with their respective products and cannot be mixed or switched around.

If you have downloaded the Adaptec 7800 Family Manager Set Driver (AIC78XX.SYS & AIC78U2.SYS) for Windows NT , it should prompt to select from two groups of driver listings.
Driver listings are:
- Adaptec AHA290x/291x/294x/394x/4944/AIC78xx PCI SCSI Controller (NT 4.0)
- Adaptec AHA-294xU2/295xU2/395xU2/AIC-789x PCI SCSI Controller (NT 4.0)

Adaptec Aha-2940uw Pci Scsi Controller Driver Free

For non-Ultra2 host adapters, Select the 'Adaptec AHA290x/ 291x/294x/394x/4944/AIC78xx PCI SCSI Controller(NT 4.0)' and press ENTER.

Adaptec Aha-2940uw Pci Scsi Controller Driver Windows 10

For Ultra2 host adapters, Select the 'Adaptec AHA-294xU2/295xU2/395xU2/AIC-789x PCI SCSI Controller(NT 4.0)' and press ENTER.

Adaptec Aha-2940u/2940uw/2940d Pci Scsi Controller Driver

If the driver fails to load, please check the resources defined on the controller.
You may have some resource (IRQ, I/O and Memory Address) conflict(s).
Please check other articles referring to IRQ and resource conflict.