Part of the DvrBARS project, by ggieseke. We are looking for "virgin" drive images. A C&DE doesn't zero-out the areas that were changed, thus increasing the size of the backup image. If a drive is written full, then a C&DE done, it would back up every sector. On a virgin drive, it would only back up what the factory image was, and skip the rest.
EDIT/ADD: What I want for myself, is just a "parts source". A "virgin" drive is just icing on the cake. As far as parts, sometimes it's easier to get them from a spare new unit than to source them.