How is it powered. Apart from being spare, why do you want 5TB? It wont give you anything that the Tesla supplied 128GB won't give other than a headache managing tons of redundant saved footage. Presumably you know that dashcam wont save anything unless you specifically tell it to, and then only 10 minutes. It will save the last 60 minutes of the last drive, then gets overwritten. And sentry events will self delete when the drive fills up. The only advantage of a large drive is if you have loads of sentry events and you don't view them for weeks at a time. Its not like a dashcam that records everything, you have to tell it what to keep.