UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2.
For more info, see Getting Started with UMDF.
When a driver receives an I/O request, the driver can use the following methods of the IWDFIoRequest interface to obtain parameters related to the request: