Instructions
Navigate to the directory on your PlayStation 3 where the file you want to delete is stored. If the file is a video, for example, open the "Video" folder and highlight the video file's name. Press "X" to begin to play the file.
Press "Triangle" to bring up the PlayStation 3 Control Panel. This window can be displayed while playing an audio or video file, or while viewing an image on your console.
Highlight the "Delete" option. Press "X" to delete the file from your hard drive, which will remove it from the PlayStation 3 media server.