Asus RT-AC66U - Manual (Page 27)

Safely removing the USB disk
IMPORTANT: Incorrect removal of the USB disk may cause data
corruption.
To safely remove the USB disk:
1. From the navigation panel, go to General > Network Map.
2. In the upper right corner, click
> Eject USB disk. When
the USB disk is ejected successfully, the USB status shows
Unmounted.