The difference between a drive in and a drive thru pallet rack system is simply whether the bays have an entry at only one end or at both ends.
Drive in and drive through pallet racking.
Drive in rack systems drive in rack loads and retrieves from the same side so the last pallet loaded will be the first pallet removed.
While construction is more or less identical drive through pallet racking differs in that it is designed to be accessed by forklifts from both ends whereas drive in pallet racking can only be accessed from the front.
High density storage racks work by utilizing standard pallet rack uprights in conjunction with rail beams or more simply rails to store the pallet loads in a very dense configuration.
In some environments it can be difficult to differentiate between the two.
Drive in and drive through pallet racking are essentially the same thing but with one distinct difference.
Drive in rack and drive thru racking are terms that are often used interchangeably.
In this system product is stored both back to back and floor to ceiling.
Drive in and drive thru pallet racks are created to utilize more unused warehouse space than any other pallet racking system available.
Both the area and the height available for use are accessible via forklifts which can actually be driven through the racks to permit additional storage access for up to six full pallets deep.
Drive in and drive through pallet racking systems are comprised of uprights and rail beams.