This is well-known and is by design.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com


"killme" <killme@discussions.microsoft.com> wrote in message
news:9502EB39-3F22-4F2D-9B12-97E5CCDCF0D6@microsoft.com...
adapter. It returns a win32 error code 55. But if I attach a device to the
adapter, it works fine. Is this the expected behaviour of port driver or
there's some other way for me to communicate with miniport driver when there's
no device is attached to the adapter.
with error status possibly by storage port driver.

Yes, here is the knowledgebase article:

http://support.microsoft.com/default...;EN-US;Q137247