Seagate ST31000640SS Internal 3.5 Inch Hard Drive

The Seagate Barracuda ES.2 ST31000640SS is a 1 TB, 7200 RPM 3.5-inch internal hard drive designed for enterprise-class storage with dual-port SAS connectivity and a compact 16 MB cache for steady multi-user performance. Built for continuous operation in servers and storage arrays, it delivers up to 1287 Mb/s of maximum internal transfer and up to 105 MB/s sustained SAS transfer, with 8.5 ms read and 9.5 ms write seek times. The drive uses a dual-port SAS interface to support multipath I/O, enhancing availability in high-demand environments. Power standards are around 12.5 W during typical operation and about 9 W at idle, while operating temperatures range from 5 to 55 C and non-operating temperatures reach −40 to 70 C; shock ratings are 63 Gs (operating) and 300 Gs (non-operating). Physical dimensions are 26.11 mm in height, 101.6 mm in width, and 146.99 mm in depth (roughly 1.02 x 4.00 x 5.78 inches), with an approximate weight of 0.68 kg. The ST31000640SS carries a 5-year limited warranty and an MTBF around 1.2 million hours, reflecting its enterprise-grade reliability for demanding workloads. In short, this Seagate drive pairs a 1 TB capacity with 7200 RPM performance, SAS 3Gb/s interfaces, and dual-port design to deliver dependable throughput in data-centre storage, NAS, and server deployments requiring consistent access, resilience, and long-term chassis compatibility.