The AS6004U 4-Bay 64TB NAS Storage Capacity Expander from Asustor is equipped with four hot swappable SATA III disk bays. Internal storage capacity is 64TB (16TB per disk, HDDs available seperately). This expander uses a USB connection and is compatible with any Asustor NAS device. It supports single disk, JBOD, RAID 0, 1, 5, 6, and 10 volumes. AES 256-bit encryption provides data protection. A built-in 120mm fan ensures that the expander remains operational by keeping it cool.