Rosewill 1.0 mm Thickness 4U Rackmount, Black Metal/Steel RSV-L4411 RSV-L4411 has 12x Hot-Swap Drives which supports up to carry 12x 3.5"/2.5" SATAI, II, & III HDD Maximum Capacity up to 24TB (12 x 2TB HDD) Modules are powered by Molex 4pin from PSU