What is "Diagnostic System Host" in my Windows 7 service list? And how is "Diagnostic System Host" service related to wdi.dll?

"Diagnostic System Host" is a Windows 7 service that "The Diagnostic System Host is used by the Diagnostic Policy Service to host diagnostics that need to run in a Local System context. If this service is stopped, any diagnostics that depend on it will no longer function." "Diagnostic System Host" service is provided by wdi.dll DLL file.

Detailed information on "Diagnostic System Host" service:

Service name: WdiSystemHost
Display name: Diagnostic System Host
Execution command: C:\Windows\System32\svchost.exe -k LocalService
Start type: Manual
Service status: Stopped
Dependencies: None

"Diagnostic System Host" service is provided by a DLL file called: wdi.dll:

Name: wdi.dll
Location: C:\Windows\System32\wdi.dll
Description: Windows Diagnostic Infrastructure
File version: 6.1.7600.16385
Size: 74.5 KB (76,288 bytes)
Modified: Monday, July 13, 2009, 9:16:18 PM

Disabling "Diagnostic System Host" service should not cause any issues when running Windows 7 system.

⇒ "Function Discovery Provider Host - fdphost.dll" Service on Windows 7

⇐ "COM+ Event System - es.dll" Service on Windows 7

⇑ 'svchost.exe -k LocalService' Services on Windows 7

⇑⇑ Windows 7 Services Tutorials