Hi - Model Number appears to be HDMI DTR-HV250 - we've had it since the big digital switchover perhaps 5-years ago.
Messages that appear are "Hard drive initialization failed" and "Record & Playback functions disabled" and "Reformat needed" - have done that twice after being warned I could lose all recordings
The 'catalyst' - I don't know, possibly too many recorded items
Had already tried unplugging and reconnecting after 10+ seconds and have now done that again but still get the same messages. Guess the unit does need replacing - do you know of any way of re-recording the recorded programmes? Perhaps to a separate hard disk or on a memory stick or something else?