I have a Sony XBR850D, I am trying to expand storage on it by using USB drive. I initially chose it as an external drive when formatting. I thought I will use it as backups for Kodi and maybe other stuff. But I am not able to copy anything to that drive because I do not have write permissions. How can I gain that? I tried to go in Kodi and select it as a backup site, but even kodi can not write to it.