Seagate ST91000642SS Constellation.2 1TB Internal HDD

The Seagate Constellation.2 ST91000642SS is a 2.5-inch enterprise internal hard drive offering 1TB of storage capacity over a SAS (Serial Attached SCSI) interface. Designed for server rooms, data centers, and networked storage arrays, the Constellation.2 line targets environments where reliability, continuous operation, and data integrity are paramount. The SAS interface provides advantages over consumer SATA in enterprise deployments, including dual-port capability for multi-path failover and higher signaling reliability under sustained workloads.

With its compact 2.5-inch form factor, the ST91000642SS is well suited for high-density rack configurations where maximizing storage per unit of physical space is a priority. It is built for 24/7 operation and is rated for the heavier duty cycles expected in enterprise environments. While mechanical drives like the Constellation.2 have been increasingly complemented or replaced by SSDs for latency-sensitive applications, they remain a cost-effective option for bulk storage, archival, and nearline roles where capacity per dollar matters more than peak IOPS.