If we have a file on a disk and create a hard link pointing to it then we have two references to the same data. If one link gets deleted it does not affect the other link as it is directly pointing to the data.
If I have two links (A and B) pointing to file ABC and I move link A to another disk then I will have two copies of the data. Link A will be pointing to the data on the new disk and link B pointing to the data on the old disk.
If I want to move both links A and B to a new disk how can I do this without end up having two copies of data on the new disk?