Seagate Exos X18 packs 18 TB helium‑filled capacity in a 3.5″ drive, spinning at 7,200 RPM with 256 MB cache and 512e/4Kn formatting for dense storage. Its SATA 6 Gb/s link delivers up to 258 MiB/s, while the unit tolerates 200 g shock and runs from 5 °C to 60 °C, making it suitable for high‑density data centers.