A:Answer Hi, Please be informed that the WD MY CLOUD EX2 ULTRA helps you to keep your media safe in a single place on this high-performance Network Attached Storage (NAS) device, access and stream it from anywhere with an internet connection. You can always replace the hard drives with higher capacity drives. To know more about the drive please refer to the user manual link: https://products.wdc.com/nas0s5/nasum/en/ex2ultra/index.html -Need Help? Please see our "'Contact Us" page for information