Why can't I put files on my external hard drive with my router?

Episode 1537 (1:41:37)

Dan from Cleveland, OH
Asus AC3200 Router

Dan wants to be able to transmit his movies over his network, but he can't see the drive he has hooked up to the router. Leo says that it sounds like the drive is set to Read-only through the Asus router Dan uses. It also depends on his file sharing settings in Windows. ScooterX says that Windows uses SMB, which is the most common file sharing standard. Heres a tech note on how (asus.com). But it will likely be very slow.