Buffalo DriveStation Duo 2-Drive Desktop DAS 6 TB Total Array Capacity: 6 TB Interface: USB 3.0 Installed Devices / Modules Qty: 2 (installed) / 2 (max) High performance NAS edition hard drives offer continuous 24/7/365 operation with enhanced RAID performance USB 3.0 offers universal connectivity for PC and Mac computers and storage servers RAID 1 support and hot-swappable hard drives provide comprehensive data protection Ideal for creative professionals, small office users, server backup and consumers High performance NAS edition hard drives offer continuous 24/7/365 operation with enhanced RAID performance USB 3.0 offers universal connectivity for PC and Mac computers and storage servers RAID 1 support and hot-swappable hard drives provide comprehensive data protection Ideal for creative professionals, small office users, server backup and consumers