I went for the manual at http://www.samsung.com/uk/consumer/tv-audio-video/blu-ray-players/blu-ray-players/BD-E8300M/XU-support

We see the following text.
"Recorded videos are DRM (digital rights
managements) protected and cannot be played
on a PC or other product. Note that files saved
on the TV cannot be used after the main board
is changed."

This means that to delete content, it must be offered in the menus since there is no support for use of this media on a PC.

Page 49 writes "Depending on the screen you are
viewing, select Delete to erase a file
from erasable media (such as a USB
device) or to delete a playlist."

The ONLY reference to deletion is by formatting. You can see an example on page 12.