Backplanes and hardwire kits are the connection fabric inside server and storage chassis: drive backplanes that turn a row of bays into hot-swappable slots, the powered backplane assemblies that carry data and power to every drive in the cage, and the wiring and connection kits that join backplanes, controllers, and power distribution inside the enclosure. When a bay stops seeing drives, this is usually the part.
These components are chassis-specific to the letter - a backplane fits one enclosure family and one drive interface generation, so order by the exact chassis model and the drives it must carry. For organizations running self-built or long-lived servers, a spare backplane per chassis family is cheap insurance, because a failed backplane takes every drive behind it offline at once while the drives themselves are fine. Cabling between backplane and controller is part of the match; confirm connector types before the maintenance window. COLAMCO supplies backplanes and internal connection kits for business, government, and education infrastructure teams.