Hi, welcome to our forums. You have posted in the correct place.
Tivo files are in mpeg2 format which produces really huge files. There is no option on our Tivo HD's to change the resolution that they are recorded in, as you could do with Series 1 Tivo's.
The only way to reduce the file size is to convert the files into a different format or use a higher compression rate.
You can do this with Tivo Desktop and choose which format you would like the .tivo files converted to.
I'm not a fan of TiVo Desktop, you can use a commercial product http://www.videoredo.com which a lot of people use (30 day free trial), or one of the free alternatives.
I use http://code.google.com/p/kmttg/.
Peter.
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