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Rescan SCSI bus on NT 4.0

Posted on 1997-08-07
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Last Modified: 2013-12-03
We are connecting a non standard scanner via SCSI to a PC using Windows NT 4.0.
We are not using a class driver, but deactivating the standard SCSISCAN device service and controlling the scanner directly by calling the API functions
CreateFile("\\\\.\\scsix:", ...) and
DeviceIoControl(...,IOCTL_SCSI_PASS_THROUGH_DIRECT,...).

All works well with the restriction, that the scanner must be switched on while booting Windows NT.

How can we avoid this restriction ?
Is there an API function to rescan the SCSI bus when the System is running ?
We intend to rescan the SCSI bus after CreateFile() fails and then try it again.

Any hint is appreciated !!
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Question by:moosach
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msmits earned 100 total points
ID: 1403338
I did this once in a program that used the ASPI (Adaptec) interface.

The problem I detected was that new devices were detected correctly,
but removed devices still showed up in the overview of available devices.
Although you got an error when actually accessing the device.

For information on the ASPI interface goto the adaptec WEB site at:

  http://www.adaptec.com

It should be possible to do the same thing with the DeviceIoControl function,
as I believe that is what the ASPI layer is using.

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