Image shows a visualization equivalent to placing all your racks slots in a row, reality is Slots would be divided into zones comprising of Gemtrac drawers or similar with shelves and slots.

Starting Point with Volumes placed in racking with voids present.

The fastest method to compact the Volumes in the racking slots is to move Volumes from end of Slots to fill gaps.

After moving Volumes.

Once the Volumes have been compacted, scan Volumes directly into TapeMaster or in to a file in order for entry into TapeMaster.