Since they are different models I bet you can't use the HD image even if you bought another 80GB drive. The only way would be to get an image for your specific model and restore that onto the new HD. PTVUpgrade has them.
If you are really into it, you could get the new 40 hour like you were thinking. Buy a big HD for your dead Tivo and restore that image to the new HD. Now you would have another one to network together. Of course thay would most likely need to be the same model as well. Just a thought. Good luck.
If you are really into it, you could get the new 40 hour like you were thinking. Buy a big HD for your dead Tivo and restore that image to the new HD. Now you would have another one to network together. Of course thay would most likely need to be the same model as well. Just a thought. Good luck.