I have an older (2008) Tivo HD (160 GB) with and expansion 1 TB external drive that has been running fine for years. Over the past two weeks it has been hanging frequently. It will become unresponsive to the remote and only display a black or gray screen. A hard reboot will bring it back to normal for a random amount of time. Sometimes it hangs on reboot, sometimes it reboots fine and goes for hours before it hangs again, but I haven't gotten to to last more than 12 hours or so before it hangs. My first thought is a hard drive issue, so I booted it into kickstart 54 and ran the S.M.A.R.T tests, and the initial quick ones pass but when it goes into the longer deeper tests, i get the freeze again (unresponsive to remote, only displaying black screen). I tried to individually test the internal drive and the external expansion drive and the same thing. It hangs before it finishes the test. I am under the impression that the S.M.A.R.T. tests are run from the bios, not from the hard drive itself, so would the fact that the unit fails when trying to run those tests indicate an issue other than hard drive? I would like to preserve what I have recorded, so would attempt to clone the drive and replace it, if that is the issue, but was wondering if anyone else has seen this?