Does shrinking volume involves actually moving files to the 'top' to make new unallocated space? windows disk management does that with disk defrag utility. I also heard 3rd part partion managers can do instantly. which one is safe? i like to shrink an external 2 tb HDD with 200 GB free space, I checked with a defrag tool the files are all over the place, free space is just here and there fragmented. obviously diskmanagement tool will take forever to organize that. can 3rd party tool just shrink those free space bits? how does it work? please anyexpert clarify. i don't want to try anything before that and lose my data.