Chenbro's RM23424M2-LC24 Storage Server chassis provides 24 hot-swap 2.5" 6Gb/s SAS/SATA hard drive bays via two HDD modules with 6Gb/s mini-SAS back plane in an efficient 2U form factor designed for the most storage server applications. The chassis does not come with a pre-installed power supply unit, however, it supports a 2U single or 1+1 Redundant PSU which can be purchased separately.