So long as the hard disk in the TiVo is the same capacity or larger than the one you are going to copy the image from you will be fine.
The only issue you will have is that the TiVo will complain about a hardware error and have limited functions, which is normal because the TSN on the hard disk and the motherboard will not match. This is remedied by doing a full clear and delete everything step which writes the motherboard TSN to the hard disk and then all is good.
Remember that even when you do begin from the start of guided setup on this tivo after modifications it will still ask if you have activated it, which you simply pick the option that says you have because all modified TiVo's are activated.
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