The HP SureStore 2U k half-height rack kit provides two storage bays, racking two half-height rack optimized modules, and consumes a low 2 EIA in a standard HP 19-inch rack cabinet. Half-height rack optimized drives include the DAT8k, DAT24k, DAT40k, CD-ROM32k, and the 4GB, 9GB, and 18GB hard disk drives.