Distinctive exterior Distinctive front panel features 12 x hot-swappable 3.5" bays or 12 x hot-swappable 2.5" bays with handle bars allowing for easy accessibility to the internal components Storage device performance HDD backplane supports 12 ports SAS / SATA drives and 12Gb/s Mini-SAS HD SFF-8643 x 3 with SGPIO Cooling capabilities Utilizing the typical front-to-back directional airflow, RM22-312 comes pre-installed with three 80mm x 38mm hot-swappable PWM fans, designed to achieve a rapid heat dissipation effect that does not easily accumulate hot air inside Sliding rail compatibility Reserved mounting holes for sliding rails which can be easily installed. Can be used with RMS03-26 rail