Decking - The material, generally made from welded wire, that is placed on shelves, rack load beams or walks to support loads of variable sizes.
The decks or flooring of a mezzanine can be made of several different types of materials depending upon the requirements, features and capacity of the mezzanine. These flooring/decking options may include bar grating, plank grating, wood planking, plywood, composite materials and cement.

Double deep rack - A racking system that is used where a greater storage density is required. It accommodates two pallet loads stacked back-to-back and requires special fork trucks called reach trucks.

Double row, double face shelving - One generally continuous row of units joined together, back to back and side to side to be serviced from two service aisles.

Double wing pallet - A pallet constructed in such a way as to have the top deck extending out from opposite sides.

Drawer storage - Storage utilizing drawers in cabinets or within shelving systems and are suitable for applications where volume of inventory turnover is low and where smaller items are being stored.

Drive in rack - This type of rack utilizes upright frames, rails, and ties to allow a vehicle to enter a storage rack structure from one side only and pick up or deliver pallets on continuous rails. Drive-in rack is used to address repetitive products and serves to take advantage of cubic space available for storage, when such unit loads do not lend themselves to block stacking.

Drive through rack - This rack is similar to drive-in rack except that the fork truck is capable of driving straight through the structure at any storage location along the aisle.

Dynamic storage system - A storage system that provides varying means of either mechanically moving storage locations or loads within the systems so as to increase storage density and/or to increase storage, retrieval and order picking throughput.