What is the scheduled task "\Microsoft\Windows\DiskDiagnostic\Microsoft-Windows-DiskDiagnosticDataCollector" on my Windows 7 computer?

"\Microsoft\Windows\DiskDiagnostic\Microsoft-Windows-DiskDiagnosticDataCollector" is a scheduled task on Windows 7 system added as part of the Windows system.

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: At 1:00 AM every Sunday of every week...
History:
   ...
   Information 2:52:09 Task completed
   Information 2:52:09 Action completed
   Information 2:50:30 Action Started
   Information 2:50:30 Task Started
   ...

Program file information about "dfdts.dll":

File name: dfdts.dll
File path: C:\windows\System32\dfdts.dll
File size: 45568 bytes
Last modified time: 7/13/2009 9:40:28 PM
File description: Windows Disk Failure Diagnostic Module
File version: 6.1.7600.16385 (win7_rtm.090713-1255)
Company name: Microsoft Corp.

"Defrag.exe" is scheduled to run once every week to defragment hard disk.

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

⇒ "Microsoft-Windows-DiskDiagnosticResolver" Scheduled Task on Windows 7

⇐ "Scheduled" Scheduled Task on Windows 7

⇑ System Scheduled Tasks on Windows 7

⇑⇑ Windows 7 Scheduled Tasks