Android TV only supports drives with FAT32 format. After you connect your drive, Android TV will check the format, if it is not FAT32 it may not read it, and you will need to either change to a FAT32 Device or Format your device to change the File System to FAT32
Note: When you format your drive, you’ll erase what’s on it. Transfer any content you want to keep before you start.
Note: Our x70 Series has an update available that will allow them to read USB devices using the NTFS
More information can be found here.