DataStation Maxi z.ul 400 GB External 3.5" Network Hard Drive ( 68746 ) 7200 RPM, 8 MB cache the most sophisticated external Network Hard Drive with NDAS technology for highly efficient data transmission Suitable for up to 64 users and all users can access concurrently the data stored within the network Supports Raid levels 0 and 1 High-quality and rugged aluminum housing for data and drive security Optimal Drive Cooling