How to open a Seagate backup plus 4tb external USB drive to install in your tivo bolt. Seagate model# Stdr4000100. Be careful, because some other models of the Seagate drive appear to have integrated USB in the drive, and don't have the required data connector. The USB to SATA converter card will be useful later when you need to plug the drive back into the computer to expand the storage from 2TB to 4TB, so be careful removing it from the hard drive. Also be careful of the aluminum lid on the external enclosure, it is pretty thin, and I bent mine up a little bit (and had to bend it back into shape).
The Backup Plus Portable 4TB USB 3.0 drive internally carries a Seagate/Samsung Momentus ST4000LM016 drive. Information about this drive is currently sparse on Seagate's website.
Please look at parts 2,3,4 for the rest of the process.