RTIV35M2SAH RAID Tower IV (black color) with 1 5X1 eSATA Hardware Port Multiplier installed. Install up to three 3.5" SATA hard drives and two 2.5" SATA hard drives of any capacity (drives not included). Drives are added or removed like tape cartridge from each drive bay with no special tool required. Connect to system via USB 2.0 or eSATA port (connecting cables included). Drives can be configured as FAST (RAID0 Striping), SAFE (RAID1 Mirroring), JBOD* (Just a Bunch Of Disks or individual drive), BIG (combined single volume), SAFE FAST (RAID 1+0 Mirror Stripped) .RAID setting via software utility under Windows, Mac OS or Linux. OS independent, can be used on any system.