Just wanted to report a successful upgrade to 8TB using a WD80EZAZ drive. Copy command took ~9 hours to move 1.3TB of video. I found the parted -l command easier to use than the fdisk -l when identifying drives. fdisk caused screen to scroll by putting drive id off the page. Unplug the mouse to avoid issues in my earlier post. Cable card setup worked without any intervention. As a burn in test, I've simultaneously recorded (4) shows, while watching a fifth and forcing a netconnect. Time to upgrade the other unit. Thanks to all who who put this procedure together.