I've read the sticky notes about this sort of topic, particularly the advise about taking care when deleting something you have copied to HDD.
I can follow the advice to use the Storage menu item to help select the desired location of the deletion but I find it isn't helping as all recordings, both on internal and external HDDs display together in one date-sorted list.
The only way I can see to be sure about which to delete is to play them in turn and watch if the external HDD light flashes regularly.
Does anyone else find the Storage choice 'correctly' gives them just either the internal OR the external programme lists?