A:Answer Hello, hankBitt. The USB feature of the Linksys MR9000 is only supported when it is set as parent mode. Also, it allows you to share the network with authentication, and it only supports the following file format: NTFS, FAT32, and Samba for Windows; and FAT32, APFS (read-only), and HFS+ for Mac. You may check out this link for more info: https://www.linksys.com/us/support-article/?articleNum=316998.