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

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

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

Name: Microsoft-Windows-DiskDiagnosticDataCollector
Location: \Microsoft\Windows\DiskDiagnostic
Description: The Windows Disk Diagnostic reports general disk and 
   system information to Microsoft for users participating in the 
   Customer Experience Program.
Actions: %windir%\system32\rundll32.exe dfdts.dll,DfdGetDefaultPolicyAndSMART
Triggers: 
History: 

Programe file information about "dfdts.dll":

File name: dfdts.dll
File path: C:\windows\system32\dfdts.dll
File size: 44544 bytes
Last modified time: 7/25/2012 11:05:28 PM
File description: Windows Disk Failure Diagnostic Module
File version: 6.2.9200.16384 (win8_rtm.120725-1247)
Company name: Microsoft Corporation

"dfdts.dll" is scheduled with no triggers.

It is recommended to disable "\Microsoft\Windows\DiskDiagnostic\Microsoft-Windows-DiskDiagnosticDataCollector" as a scheduled task, unless you want Microsoft to collect your data.

⇒System Scheduled Tasks on Windows 8

⇒⇒Windows 8 Scheduled Tasks