What is the scheduled task "\Microsoft\Windows\DiskDiagnostic\Microsoft-Windows-DiskDiagnosticResolver" on my Windows 8 computer?

"\Microsoft\Windows\DiskDiagnostic\Microsoft-Windows-DiskDiagnosticResolver" is a scheduled task on Windows 8 system added as part of Windows installation.

You will see "\Microsoft\Windows\DiskDiagnostic\Microsoft-Windows-DiskDiagnosticResolver" listed on Task Scheduler with the following information:

Name: Microsoft-Windows-DiskDiagnosticResolver
Location: \Microsoft\Windows\DiskDiagnostic
Description: The Microsoft-Windows-DiskDiagnosticResolver warns 
   users about faults reported by hard disks that support the Self 
   Monitoring and Reporting Technology (S.M.A.R.T.) standard. This 
   task is triggered automatically by the Diagnostic Policy Service 
   when a S.
Actions: %windir%\system32\DFDWiz.exe 
Triggers: At log of any user
History: 

Programe file information about "DFDWiz.exe":

File name: DFDWiz.exe
File path: C:\Windows\system32\DFDWiz.exe
File size: 77824 bytes
Last modified time: 7/25/2012 11:08:22 PM
File description: Windows Disk Diagnostic User Resolver
File version: 6.2.9200.16384 (win8_rtm.120725-1247)
Company name: Microsoft Corporation

"DFDWiz.exe" is scheduled to run at log on time. It is disabled by default.

It is recommended to disable "\Microsoft\Windows\DiskDiagnostic\Microsoft-Windows-DiskDiagnosticResolver" as a scheduled task.

⇒System Scheduled Tasks on Windows 8

⇒⇒Windows 8 Scheduled Tasks