Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results

Before Posting...
Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

Mount volume question

OSR_Community_UserOSR_Community_User Member Posts: 110,217
Hi all,

In a filter driver, I use pretty much the same technique used in the SFilter
sample to detect when a new volume is mounted, i.e. I intercept
IRP_MN_MOUNT_VOLUME requests. In the completion routine, I retrieve the VPB as
sp->Parameters.MountVolume.DeviceObject->Vpb. So far, it worked well, but
under Japanese NT 4, when mounting a CD, I always get a VPB with
Vpb->DeviceObject = NULL. I'm wondering what might be the difference, or there
is something wrong with the code.

Any help would be greatly appreciated. Thanks in advance.


Get free email and a permanent address at
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Writing WDF Drivers 7 Dec 2020 LIVE ONLINE
Internals & Software Drivers 25 Jan 2021 LIVE ONLINE
Developing Minifilters 8 March 2021 LIVE ONLINE