Replacing the Tivo Bolt internal HD

Tivo forum newbie.

I have a Tivo Bolt 500GB. Bought this year. (2016)

I tried connecting an external 3TB Fantom esata drive and Bolt says it doesn't support it (formatted for NTFS), and still doesn't (formatted for MAC extended (journaling)).

So, I am planning to order a
Seagate 4TB Laptop HDD SATA 6Gb/s 128MB Cache 2.5-Inch Internal Hard Drive (ST4000LM016) from Amazon.

What steps to replace it as the internal Bolt HD? And, will it use the entire 4TB, or format it up to 2TB...

Replacing the Tivo Bolt internal HD

Replacing the Tivo Bolt internal HD