October 2021
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Recently had a situation where I wanted to immediately reclaim the free space after deleting a vast amount of data from a disk with Data Deduplication enabled.

After scouring the Microsoft Docs i came across this page: Microsoft Docs Reference

Scroll down to ‘Garbage Collection jobs’.

I ran the below PowerShell command to start the Garbage Collection task. Replace ‘E:’ with your drive letter. 

Start-DedupJob E: –Type GarbageCollection