Hard Drive Mounting Bracket for M350 Mini-ITX Enclosure This bracket is needed only in instances where a 2nd hard drive is needed whether for additional storage capacity or taking advantage of RAID controllers. 40x40mm fans can be installed (2 per bracket) for additional cooling. Please Note: The M350 is already equipped with one Hard Drive Mounting Bracket. ONLY the Bracket. Case Hard Drives and Fans NOT included.