4U rackmount chassis supports up to 15 add-on cards Shock-resistant disk drive bay design holds up to three 5.25" and one 3.5" disk drives Front accessible USB & PS2 interfaces for easy data transfer Dual front-accessible filtered cooling fans provide optimized and streamlined airflow ACP-4000 front LEDs indicate power status, fan operation, in chassis temperature, and HDD activity Lockable front door prevents unauthorized access Supports 300 W single PS2 and redundant ATX power supplies