However, if your original TiVo was a 2-drive model (30+15) then you may have a problem going from 120GB to 250GB and keeping your recordings, as you may already have used up all 3 of your allowed MFS partition pairs.
You can check this by running mfsinfo against the 120GB drive. If it says you can expand 4 more times then you're OK; if it says 3 then you will have to junk your recordings and restore from a divorced backup or resort to a very dodgy practice which I've never tried.
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