Photoviewer/HDDs of today do not have the processing power or firmware to view the actual RAW files...they can only read the attached Jpg thumbnail... what RAW support they claim just means they can extract the thumbnail and display it on the screen... note, this is the thumbnail attached to the RAW file and not a seperate full sized Jpg file of the image that can be saved in parallel to the RAW file by some cameras... which is why I invested in a PD70X...at least it has a system that verifies the integrity of the copied file...