This is a genuine Hitachi Ultrastar 1.2TB SAS 12Gb/s hard drive, part number 0B27977-HIT. Engineered for demanding enterprise environments, it boasts a high 10K RPM spindle speed and a 128MB cache for exceptional performance and data throughput. The 512e sector format ensures compatibility with modern storage systems, making it a reliable choice for servers and data centers requiring robust and fast storage solutions.