I've organized my set of podcasts as playlists of songs. The playlists are grouped in playlist folders. After deleting songs and/or playlists and/or playlist folders, the number of songs on my device remains the same, as does the amount of free space. So, apparently, the files still reside on the device. However, they are not visible in itunes or when exploring via the touchscreen. How can I free up the occupied space? --- Post Merged, Jul 12, 2017 --- Finally found the solution myself. It turnes out to be quite easy: the podcasts were organised in playlists, however, the podcasts themselves are visible in the podcast section. Deleting them there solved the issue. Seems trivial afterwards.