RT54S2HMEU RAID Tower V (black color) with 1 4x1 HPM installed. Install up to four 3.5" SATA hard drives of any capacity (drives not included), and four 2.5" SATA hard drive of any capacity (drives not included). 3.5" Drives are added or removed like tape cartridge from each drive bay with no special tool required. 2.5" Drives are installed onto drive enclosures that can be added or removed like tape cartridge from each drive bay. Connect to system via eSATA 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