Cannot get timeshift to work please help

[yassss69]

My tv is the SAMSUNG - UE75DU7100KXXU 75" Smart 4K Ultra HD HDR LED TV with Bixby and i have connected an external hardrive but it won't allow me to pause live tv , any advice would be great 

Thanks 

[johnz237]

Hi! Welcome to the samsung members community!

Taken from online
it is recommended to use a USB hard disk that supports USB 2.0 or later and 5,400 rpm or higher. RAID-type USB hard drives and USB memory are not supported

ensure the hard drive is correctly connected, formatted for the TV, and that the time-shift function is activated

[yassss69]

How do you activate time shift ?