RT5835HMEU RAID Tower V (black color) with 1 4x1 HPM Enclosure Version installed. Install up to eight 3.5" SATA hard drives of any capacity (drives not included). 3.5" Drives are installed onto drive enclosures that can be added or removed like tape cartridge from each drive bay. Connect to system via eSATA or USB port (connecting cables included). Drives can be configured as FAST2 (2 drive RAID 0 Striping), SAFE2 (2 drives RAID1 Mirroring), BIG 2 (2 drives Concatenation), 3 drives in RAID 3, or 3 drives in RAID 5. For more information, click here