Synology HAT3310 Plus Series 3.5-inch 12TB SATA III Internal NAS HDD Designed to meet the reliability, endurance, and performance requirements of 24/7 storage in small- and medium-sized business storage systems, the 12TB HAT3310 Plus Series SATA III 3.5" Internal NAS HDD from Synology delivers NAS-class reliability to ensure consistent performance in high-uptime and multi-user environments. The HAT3310 Plus has passed 500,000 hours of testing, has a Mean Time Between Failure (MTBF) rating of 1.2 million hours, a yearly workload rating of 180TB, and is filled with helium instead of regular air. Also featured is a storage capacity of 12TB, a SATA III 6 Gb/s interface, a 512MB cache, and a rotational speed of 7200 rpm, all of which help to ensure uninterrupted data transfers with sustained speeds of up to 281 MB/s. Reliable Always-On Operation Backed by a 1.2 million hours MTBF and 180TB per year workload rating. Tested for Maximum Reliability Stringent validation and up to 500,000 hours of testing ensure reliability in Synology systems. Seamless Firmware Updates Firmware updates can be performed directly in Synology DSM. Reliable Recording Technology Conventional magnetic recording (CMR) technology offers consistent performance. Engineered for Endurance Synology Plus Series HDDs are backed by a 1.2 million hour Mean Time Between Failures (MTBF) rating and 180TB per year workload rating, which is up to three times the limit of conventional desktop hard drives. Over 500,000 hours of compatibility and stress testing ensure smooth operation even under multi-user workloads. Convenient Firmware Updates Users are automatically notified when firmware updates become available for Synology Plus Series HDDs and can update drives seamlessly from DiskStation Manager (DSM) on their Synology storage system, eliminating the need for third-party tools and disk removal for firmware updates.