Query regarding the GUID_TARGET_DEVICE_REMOVE_COMPLETE vs GUID_IO_MEDIA_REMOVAL

Question

Hi, 

I have question regarding the event handling of USB drive. In my driver code i am getting disk device object pointer for USB device and then registering target device change PNP notification on the file object. 

IoGetDeviceObjectPointer(DrvName, FILE_READ_ATTRIBUTES, &pFileObj, &pDevObj);

...

IoRegisterPlugPlayNotification(EventCategoryTargetDeviceChange,.., pFileObj,..); 

When i do surprise remove the USB drive from the system, i am not getting the GUID_TARGET_DEVICE_REMOVE_COMPLETE event as per this doc https://docs.microsoft.com/en-us/windows-hardware/drivers/kernel/handling-a-guid-target-device-remove-complete-event but getting event GUID_IO_MEDIA_ARRIVAL. 

Why this strange behavior, is there anything wrong in my PNP registration.? 

Thanks,

Poo

Answer 1

Any one can clarify my question?

Answer 2

The notifications you get here depend on many things, some of which are not obvious.  If your device is considered "removable", then you get the equivalent of an "eject", not a surprise removal.  I'm guessing that what you're seeing.  If you were opening the USB device rather than the disk device. I'm guessing you'd see the removal notification you expect.

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Tim Roberts | Driver MVP Emeritus | Providenza & Boekelheide, Inc.

Answer 3

I am opening using this name 

"\\DosDevices\\PhysicalDrive1" to open the device. In this case i am opening disk or USB device?