Seagate St9500620ss Constellation.2 500GB 2.5" Internal HDDHigh Density Storage: Seagate Constellation. 2 500GB 2. 5" Internal Hard Drive The Seagate Constellation. 2 offers a compact and reliable storage solution for enterprise environments. This 2. 5 inch hard drive delivers 500GB of capacity with enterprise class reliability and low power consumption. Designed for nearline applications, the Constellation. 2 maximizes data center footprint and ensures efficient data storage. Capacity: 500GB Form Factor: 2.