Sometimes, we run into a situation when we badly need to hook some kernel function, but are unable to do it via conventional PE-based hooking. This article explains how kernel functions can be directly hooked. As a sample project, we are going to present a removable USB storage device as a basic disk to the system, so that we can create and manage multiple partitions on it (for this or that reason, Windows does not either allow or recognize multiple partitions on removable storage devices, so we are going to cheat the system). On this particular occasion, we will hook only one function, but the approach described in this article can be extended to handle multiple functions (for example, one of my projects required direct hooking of quite a few functions from the NDIS library). You should clearly realize that this article is about direct hooking and not about dealing with USB storage, so please don t tell me that the sample problem may have been solved differently.