Seagate IronWolf 4TB 3.5-inch SATA III Internal NAS Hard Drive, model ST4000VN006. Features a 5400 RPM rotation speed, 256 MB cache, up to 202 MB/s sustained data transfer speed, CMR recording technology, rotational vibration sensors, and NAS-optimized performance for compatible multi-bay storage systems. Designed for compatible NAS devices, desktop computers, and PC storage applications. Retail kit code ST4000VNZ06. UPC 763649173817. Open-box item with visible wear on the original packaging. Includes the hard drive and packaging shown in the photos.