Drive cabinets and enclosures give storage a home outside the computer: single-drive external enclosures, multi-bay cabinets for backup and bulk capacity, and rack-mount drive shelves that expand servers and storage systems. They are how drives are added, reused, and retired without opening a chassis.
Three attributes settle the choice: the drive form factor and interface the cabinet accepts, the host connection and its real throughput, and - for multi-bay units - whether redundancy is handled in the cabinet or by the host. Match the enclosure's interface generation to the drives going in it, since a fast drive behind an old bridge performs like the bridge. For anything holding data that matters, prefer cabinets with monitored fans and room to breathe; heat is the quiet killer of drive arrays. COLAMCO quotes enclosures and the drives to fill them as one order for business, government, and education buyers.