Moving folders · Data Parking (the two-pane mover)
How are folder sizes measured in Data Parking?
Short answer: Each folder shows everything inside it at every depth, including hidden files, measured as the room it takes on disk — the same space you'd get back by moving it. A spinner means it's still being counted; refresh re-measures.
Each folder shows everything inside it at every depth, measured as the room it takes up on disk — the same room you get back by moving it. Hidden files are included, because they take up real space and move with the folder.
Sizes fill in from the top of the list as they're worked out, quietly and at a pace that leaves your own work untouched. A folder still being counted shows a spinner, never "0 bytes", so an unmeasured folder can't be mistaken for an empty one just before you move it.
If something deep inside a folder has grown, use the pane's refresh button to re-measure it from scratch.