Sony VRD-MC3 - Manual (Page 38)

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To stop recording
You cannot stop while recording is in progress. You can only stop recording
by pressing the
(Stop) button after a disc becomes full.
Note on Incremental Recording
Always use the 1 (Power) button to turn off the DVDirect after Incremental
Recording is finished. If you turn off the power by pulling out the AC power
cord, the DVDirect will not be able to detect newly taken video properly, and
Incremental Recording will not be possible the next time you attempt to
perform it.