Seagate 4TB NAS HDD SATA 6Gb/s 64MB Cache Internal Bare Drive with +Rescue Data Recovery Services (ST4000VN003) Seagate NAS HDD is built and tested to provide industry-leading performance for small NAS systems Gasworks' technology supports customized error recovery controls, power management and vibration tolerance for optimal performance and reliability in a 1- to 8-bay solution with 20 users or less NAS error recovery controls optimize drive health by helping to ensure drives are not dropped from the NAS and sent into a RAID rebuild Improved vibration tolerance and emission in multi-drive systems with dual-plane balance Advanced power management supports multiple power profiles for low-power, 24 x 7 performance Quiet drive operation enhances customer experience in living room or office environments Built and tested to provide industry-leading performance for 24x7 NAS applications Includes NASWorks technology to support customized error recovery, advanced power management and vibration tolerance features Designed for home servers or desktop NAS solutions, small-business file sharing, backup server applications Available in 2TB, 3TB and 4TB capacities Always on, 24x7 - 1M hours MTBF This model includes 3 years +Resuce Data Recovery Services to protect against data loss