As a storage device, a horizontal carousel consists of a fixed number of adjacent storage columns or bays that are mechanically linked to either an overhead or floor mounted drive mechanism to form a complete loop. /n Each column is divided into a fixed number of storage location or bins which in most applications are constructed of a welded wire frame. /n Loads consisting of containers or totes may be inserted and retrieved either manually or by an automatic inserter/extractor mechanism. /n However, rotation of the carousel, whereby a specific storage location is brought to the picking location, is almost always controlled automatically. /n See also Vertical Carousel, Vertical Lift Module, Rotary Rack, and/or AS/RS.