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DrivePool does not automatically remove empty folders from poolparts during balancing (basically for redundancy reasons; some pool metadata is stored as AD streams attached to the folders and the "space cost" of this is normally very low). The upshot is that so long as the "abracadabra" folder tree is showing 0 bytes (as an administrator) and does not contain any hidden system folders (e.g. $recycle.bin or system volume information) then it can be safely removed manually while the DrivePool service is stopped; the only thing you'd "lose" is some extra redundancy.