How to use CreateFile for windows7

Is there more than one volume on the physical Disk ?

There may be more than one volume. But in this case there is only one volume.

Vista and Win7 don't let you write to physical disk or partitions that have mounted file systems on, even as administrator...

it sounds like you've still got something with a mounted file system on there. If you've done the three things outlined (lock the volume, dismount it, remove DOS device) for each volume on the physical disk then I can't think of a lot else to
suggest...but it still sounds like a permission problem.

HTH....

Thanks for replying.
I was thinking, I am doing something wrong in the source code which i attached.
But thanks for your confirmation.