Mine does not have a hard drive so I just buy DVR-Rs you can get 100 relatively cheap these days.
That should work just as well. My DVR is a Motorola Moxi, supplied by my cable company, and it has the minimal hard drive. It will not burn to DVD.
I just “knew” when recording on that 80GB with HD TV it would not be sufficient. I was correct.
Hope all is well in your corner of the world.