Exos X Series Hard Drives The most scalable drives in the datasphere, Exos X series hard drives integrate the latest technology in support of a secure and reliable cloud data centre. Scalable. Responsive. Innovative Designed to handle the most rigorous workloads, the Seagate Exos X series enterprise class drives are perfect, high-reliability solutions for servers, storage systems, and business-centric NAS systems. Whatever your applications, there’s an Exos drive for it. Exos X18 Designed for maximum storage capacity and the highest rack-space efficiency, delivering up to 18 TB capacity.