The 3.5-inch internal hard disk Seagate BarraCuda (ST4000DM005) is a capacious and reliable mechanical storage solution designed to offer excellent balance between storage density, energy efficiency and operational fluidity. With a storage space extended to 4TB (4000 Gigabyte) , this hard drive is the ideal choice to expand the secondary memory of desktop personal computers, office workstations, centralized backup systems, home NAS devices and DVR video recording systems compatible with the SATA standard. Specifications Hardware Brand : Seagate Line/Series : BarraCuda Model : ST4000DM005 Product type : Hard Disk Drive (HDD) internal mechanic for computer and storage Form factor : 3.5 inch (Standard for PC Desktop, NAS and DVR) Overall capacity : 4 TB (4000 GB) Connection interface : SATA 6VRier Gbps (retrocompatible with SATA 3 Gbps).