I started here: A Guide to Upgrading Your Tivo Bolt, Tivo Premiere, Tivo Roamio, Tivo Roamio OTA, Tivo HD, Tivo Series 3 or Tivo Series 2 (Easily upgrade your Tivo Bolt, Roamio or Premiere to 300 Hours+ HD Capacity) - Also includes instructions on how to fix a broken Tivo. Bolt Hard Drive Upgrade Choice After selecting and purchasing a drive, following the instructions in the first link to install it. Then after testing in the Bolt, removed and connected to a PC to expand the drive past 3TB MFS Reformatter (mfsr) Its easier than it looks, and effort should be rewarded as long as you try to understand what you are doing, and don't rush past what you understand. Verify each step as best you can before moving on to the next. Good Journey.