I bought the player as a second unit, because it provides the Möglichket to connect an external hard drive. My main instrument, a Panasonic Blu Ray disk recorder also has the ability to connect an external USB HDD. Unfortunately, the data are stored in a different, non-readable format with this unit. Another drawback: Rewrite BD RE Blu Ray is not (usually numbering) specified when searching the title of the recorded program, but only the automatically generated file name.