At the first look it seems that the folders / files on the new Sony digital camera DSC-HX9V, but also possibly for other model, are impossible to delete nor modify. From Windows explorer the folders and files appear as "read only". But in fact per default the sony device set the USB connection to "auto", but the mode you really want is the mass storage mode.
To do that on the sony camera:
menu --> main settings -> USB Connect Setting -> "select" Mass Storage
Now you will see three volumes on the camera; one of them is the storage place for pictures.
