A redundant array of independent disks (RAID) module converted from a 2.5-inch specification to a 3.5-inch specification is characterized in that two 2.5-inch SATA hard disks are installed within a standard 3.5-inch SATA RAID module, so as to form a RAID having two hard disks or two stand-alone SATA hard disks for mounting the RAID module including two 2.5-inch hard disks within a 3.5-inch disk drive slot of a common computer housing, or any other devices that can receive a 3.5-inch disk drive.