You can launch the tool through several methods. Before starting, ensure all work is saved, as the diagnostic runs in a pre-boot environment that requires a full system restart.
Press Windows Key + R , type mdsched.exe , and hit Enter. windows memory diag
Windows Memory Diagnostic is a competent, lightweight memory tester for initial triage. Its tight integration with Windows and lack of external media make it convenient, but its limited pattern set and absence of per-module reporting mean it should not be the sole tool for memory validation in critical environments. For definitive RAM testing, complement WMD with MemTest86 and individual DIMM isolation. You can launch the tool through several methods
WMD offers three levels of testing, selectable via F1 during boot: Windows Memory Diagnostic is a competent, lightweight memory
The tool runs in a minimal, pre-boot or post-boot environment to minimize interference from the OS and other drivers.