Support 4 x 3.5" SATA2/SATA3(6G) and SAS-1/SAS-2(6G) HDD, The most major feature of this C338 chassis is the depth is merely 380mm deep its cost effective but very high quality standard equipped with two Sunon 80mmx25mm 2ball bearing fans behind the front bezel with dust-prevent filter optional two Sunon 60mmx25mm 2ball bearing fans installed at rear panel of chassis which is the best solution for regular server or enterprise environment.