Mobile shelving can be opened and closed when required, therefore requiring only one aisle for access. This means capacity within a given area can be substantially increased.
Comparison of storage is most easily achieved by calculating a storage factor for each type of equipment. This is simply the result of dividing the capacity (in linear meters) by the area occupied (in square meters) by the area occupied (in square meters) including the area necessary to access the records. The higher the storage factor the more efficient the equipment.