The Data Stacker family of stackable external expansion chassis provides a modular, cost-effective, and reliable housing for half-height SCSI hard drives or front-loading removable media devices. With the Stacker's Snap-n-Stack design, one and two bay units can be conveniently added or removed to create a durable and flexible enclosure for SCSI devices. Each bay of the Data Stacker contains its own cooling fan, as well as device activity and fault indicators.