Does anyone know of a compatible e sata external drive that will work with Direct tv high def dvr hr 23 sat box ? Is seagate any good?

Hello, Im new to this forum, but looks great from what ive read. I have a question. I have a direct tv hd dvr hr 23. I have a monster surge suppressor. I want to connect the coax cable in to the monster surge , but there is only one in and out for the satellite. There are 4 coax connections. But...