scsi driver problem

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The Problem:

Installing win2000 Server final release on a ide drive is ok, but when i try to access my u2w hd on an advansys asb3940u2w i got problems. I do the following steps:

- install win2k server

- go to the device manger, and check the unknown scsi device

- update driver, and select the right one (asc3550.sys)

- the driver will be installed, and the drives are ready, no reboot necessary

- i format the scsi drives, copy data on it,..

- everything is fine

- reboot the machine

- device manager

- here it is again, my unknown scsi device

- no chance to update my scsi-controller driver

- no other conflicts, the conntroller has no resource conflicts..

 

Where is the problem? I've checked it already 3 times, always the same behaviour, fresh win2k, update driver, working, reboot, no scsi drive available...