Hi all
I need to be able to create a PnP filter for a removable usb flash
drive device - which is typically handled by the Usb mass storage
class driver. The filter would need to register an additional
interface for the device PDO in the AddDevice routine

I need to be able to get a handle to the physical drive object ....
(similar to user land \\PhysicalDriveX). If I create an Inf with the
PnP id of the usb drive and set the filter driver to be an Upper
filter then I think this would layer the filter on top of the usbstor
created device .. .and would not be part of the disk object stack ...
right ?
So, how would one go about getting a handle to the physical
drive .. ? Does the filter have to be a disk class upper filter ?