WD Gold 20TB HDD WD202KRYZ, set of 2. These were kept for NAS maintenance. They have been used for a few startups and tests, with short operating hours and no operational issues. Please refer to the 9th and 10th CDI captures for the operating status. The outer boxes are not included. Everything in the photos is what's included. WD Gold HDDs are built for use in enterprise-grade storage systems and data centers, and are widely compatible with major enterprise operating systems. Specifications: Capacity: 20 TB Form Factor: 3.5-Inch Connector: SATA Interface: SATA Transfer Rate: up to 269MB/s Disk Speed (RPM): 7200 RPM Recording Technology: CMR Cache Size: 512MB Endurance (TBW): 550TB/year Size (LxWxH): 147mm x 101.6mm x 26.1mm Weight: 690g Product Model: WD202KRYZ Operating Temperature: 5°C to 60°C Thank you.