This is a set of an HDD case and two 8TB HDDs. It was used for full recording. One day, it suddenly stopped recording. I don't know if the case or the HDDs are faulty. There has been no impact, and there are no scratches. Please understand that this is a junk item before purchasing. Western Digital HDD 8TB WD Red NAS RAID 3.5-inch Internal HDD WD80EFAX Digital Storage Capacity: 8 TB Hard Disk Interface: Serial ATA Connectivity Technology: SATA Brand: Western Digital Features: Portable Hard Disk Form Factor: 3.5 inches HDD Case Body Color: Black, Front Door: Silver (Aluminum molded color) Interface: [Device Side] SATA I (1.5Gbps) / II (3.0Gbps) / 3.0 (6Gbps) [Host Side] USB3.1, Gen2 (10Gbps) USB Connector Type: USB3.1 Type-C Cooling Fan: 7cm square, 2,000rpm±10% Noise Level: 26dB (measured for the cooling fan only) Dimensions: Width 130 x Height 121 x Depth 217mm (excluding protrusions) Weight: Approximately 1,960g (excluding drives) Temperature/Humidity: Temperature 5-35°C, Humidity 20-80% (non-condensing, within the operating range of the connected PC)