The Exos X-Series hard drives are the most scalable drives in the data sphere, offering the latest technology to support a secure and reliable cloud data center. Seagate's Exos X-Series enterprise hard drives are designed for demanding workloads, making them perfect, highly reliable drives for servers, storage systems, and business-oriented NAS applications. With an Exos drive, you can never go wrong, regardless of the application. The Exos X18 is designed for a maximum storage capacity of up to 18 TB and efficient utilization of available rack space.