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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.
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 AHA-2940UW Pro PCI SCSI Controller is not only easy to use but is also compatible with a lot of other applications. This makes it a choice controller for most users. The controller SCSI Card in the Adaptec AHA-2940UW Pro PCI SCSI includes certain features that make it the controller of choice for many users. How to install your adaptec pci card (html 74 kb) differential scsi (html 68 kb) connecting wide and narrow (html 73 kb) Installing Drivers or Software cd install netware 401 (html 69 kb) cdrom in dos (html 69 kb) 7800 netware instructions (html 81 kb) 7800 family manager set 98 contents (html 68 kb) installing 98 driver (html 70 kb). Adaptec aic-7870 pci scsi controller. FlyTV Express mini Driver download.

'Adaptec AHA290x/291x/294x/394x/4944/AIC78xx PCI SCSI Controller(NT 4.0)'

Adaptec Aha-2940uw Pro Pci Scsi-controller Driver Download 3

'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.

Adaptec Aha-2940uw Pro Pci Scsi-controller Driver Download Free

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.