The Roamio tivos are the first retail offering to have a built in Flash that houses the "executable" portions of the tivo software (as opposed to the data, e.g. videos, program guide data, etc.) Presumably, this should allow them to tolerate replacement of the internal hard disk (termed a "data disk") with a blank/new hard disk and be able to boot and rebuild the internal disk. One would still lose recordings, but at least it would obviate the need for backup images. I'm wondering if anyone has tested this yet (to confirm that it will rebuild the data disk if provided a new drive) and can say whether or not the tivo will attempt to fully utilize the new drive (potentially to 3GB or beyond).