Vantec NexStar Hard Drive Duplicator - USB 3.0 (NST-DP100S3) Standalone Duplicator, design to use without connecting to a system. Simplifying the Duplication process using Sector to Sector Cloning Design to Duplicate Current High Capacity 4TB drives and serve as a Dual Bay Hard Drive with a combined capacity of 8TB Simple One Button Duplication for easy worry-free Cloning. Press one Button and walk away while it duplicate the drive Simple One Button Duplication (OTD) for easy worry-free Cloning. Design to Duplicate Current High Capacity 4TB drives and serve as a Dual Bay Hard Drive Dock with a combined capacity of 8TB. SuperSpeed USB 3.0 Connection when using it as a Dual Bay Hard Drive Dock to give you the Maximum File transfer or Backup. Standalone Duplicator, design to use without connecting to a system.