Three types of device objects are related to persistent memory on Windows Server 2019 and Windows Sever 2022: the NVDIMM root device, physical INVDIMMs, and logical persistent memory disks. In Device Manager, physical INVDIMMs are displayed under Memory devices, while logical persistent disks are under Persistent memory disks. The NVDIMM root device is under System Devices. The scmbus.sys driver controls the NVDIMM root device.

The nvdimm.sys driver controls all NVDIMM devices, while the pmem.sys driver controls the logical disks. Both the nvdimm.sys and pmem.sys drivers are the same for all types of persistent memory, such as NVDIMM-N and Intel Optane DC Persistent Memory (INVDIMM).

The following figure shows the Device Manager on a system with 12 INVDIMMs across dual CPU sockets and two persistent storage disks: