What is the scheduled task "\WPD\SqmUpload_S-1-5-21-...-1001" on my Windows 8 computer?

"\WPD\SqmUpload_S-1-5-21-...-1001" is a scheduled task on Windows 8 system added as part of Windows installation.

You will see "\WPD\SqmUpload_S-1-5-21-...-1001" listed on Task Scheduler with the following information:

Name: SqmUpload_S-1-5-21-...-1001
Location: \WPD
Description: This task uploads Customer Experience Improvement Program (CEIP) data for Portable Devices
Actions: %windir%\system32\rundll32.exe portabledeviceapi.dll,#1
Triggers: At 12:00 PM every day
History: 
   Information 8:01:00 Task completed
   Information 8:00:48 Action completed
   Information 8:00:48 Action started
   Information 8:00:48 Task started
   Information 8:00:48 Created task process
   Warning     8:00:48 Missed task started
   ...

Programe file information about "PortableDeviceApi.dll":

File name: PortableDeviceApi.dll
File path: C:\windows\system32\PortableDeviceApi.dll
File size: 619520 bytes
Last modified time: 7/25/2012 11:06:58 PM
File description: Windows Portable Device API Components
File version: 6.2.9200.16384 (win8_rtm.120725-1247)
Company name: Microsoft Corporation

"PortableDeviceApi.dll" is scheduled to run every day.

It is recommended to keep "\WPD\SqmUpload_S-1-5-21-...-1001" enabled as a scheduled task.

⇒System Scheduled Tasks on Windows 8

⇒⇒Windows 8 Scheduled Tasks