Help Please - Tivo TCD746500

Please help me. I need to replace my drive but my old drive is a TB drive and I'm replacing with a 500gb drive. I have the img but I recently had a bad medication reaction and it has caused me to get easily overwhelmed and anxious. I can't remember how to do this and I can't seem to find my answers in the forum. I know they're there, but I can't find them. I am gonna use the old drive as an external so I don't need to clone or save anything from it. What I don't know is how to format the...

Help Please - Tivo TCD746500

Help Please - Tivo TCD746500