Sony RDR-HX900 Operating Instructions Manual page 7

If you arc using a DVD-RW (VR mode) or
the HDD, you can watch a program from
the beginning while it is being recorded
(page 60).
Recording
Watch one title while recording another - Simultaneous Rec and Play
"_ If you are using a DVD-RW (VR mode) or
the HDD, you can watch a previously
recorded program while recording another
program on the same disc (page 60).
Recording
Copya recorded title to and from the HDD- Dubbing(HDD ,--. DVD)
"_ Create copies of your favorite titles for
safekeeping by dubbing them to a DVD, or
make a copy of your friend's recordings by
dubbing them to the HDD (page 72).
Automatically dub DV/Digital8 tapes - DV/Digital8 Dubbing(DV --* HDD/DVD)
"_ Connect your digital video camera to the
DV IN"jack and automatically dub the
entire contents or just selected scenes to a
DVD disc (page 77).
Control
A list of recordable and playable discs is oll page 8.