Seagate IronWolf ST4000VN006 4TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive Optimized for NAS with AgileArray enables Dual-Plane Balancing and Time-Limited Error Recovery to deliver best-in-class RAID performance in multi-bay systems. Always On, Always Accessible IronWolf drives are designed for 24x7 usage, allowing users to access their data any time, anywhere. All-CMR Portfolio All IronWolf drives utilize Conventional Magnetic Recording (CMR) technology for consistent, best-in-class NAS performance. Up to 18TB Broad range of capacity options to deliver scalable and cost-efficient storage solutions. Built Tough IronWolf drives are rated for 180TB/year workload, allowing consumer and commercial NAS users to seamlessly store and work with large amounts of networked data. Rotational Vibration (RV) sensors1. Built-in RV sensors for vibration tolerance and consistent performance in multi-bay systems. IronWolf Health Management (IHM)2 Actively protect your NAS data with Prevention, Intervention, and Recovery recommendations to ensure peak system health. Peace of mind with Data Recovery3 IronWolf drives include three years of complimentary Rescue Data Recovery Services - in-house secure facilities, with an industry-leading recovery rate of 95% - so you do not have to incur high recovery costs in the event of accidental data corruption or drive damage.