I have a Sony Bravia KDL-32WD572. This has a record function to USB HDD. It seems only to record the one I'm watching. I just tested it and when set to record (e.g.) BBC1, I was not able to watch a different channel (e.g. BBC2). And when I was watching BBC2 (having set a recording on BBC1) when the time for the recording came, it changed to BBC1.

Is this all it will do or have I missed something?

Thanks