WD media always reading

hi i have a question if any one can help me please, i have a WD network Media player and it is connected to My Book 500 GB by USB, i am using it since 9 month but suddenly it is keep on scanning files inside the HDD meaning as long as the device is power on, it’s detecting all the time the HDD but i can access normally my Media  but it’s slow sometimes  so what i can do? the problem from the Media device or from the HDD ?? thxx

Try deleting the hidden .wdtv folder.