StarTech.com Spare Hard Drive Tray for the DRW115SATBK Mobile Rack Allow multiple 3.5" SATA drives to be used with a single DRW115SATBK installation Maximize performance, with file transfer speeds up to 6Gbps when paired with SATA III HDD and controller Compatible with DRW115SATBK Mobile Rack/Drive Drawers Key lock mechanism Dual 40mm ball bearing cooling fans Rubber shock absorbers Aluminum construction Power and fan status LED Allow multiple 3.5" SATA drives to be used with a single DRW115SATBK installation Backed by a 2-year warranty and free lifetime technical support Compatible with DRW115SATBK Mobile Rack/Drive Drawers Key lock mechanism Dual 40mm ball bearing cooling fans Rubber shock absorbers Aluminum construction Power and fan status LED