Magnavox ZV457MG9A Owner's Manual page 56

You will need to finalize DVD+R, DVD-RW or DVD-R to
play them back on other DVD players.
Finalizing may take several minutes up to an hour.
A shorter recording period on the disc will require a
longer time period for finalization. Do not unplug the
power cord during finalization.
1
Press [SETUP].
Use [A / V] to select "Disc Edit", then
press [OK].
"Disc Edit" menu will appear.
Use [A / V] to select "Finalize", then
press [OK].
Use [A / V] to select "Yes", then press
[OK].
Finalizing will start.
To cancel finalizing...
(DVD-RW only)
To cancel finalizing at step 4, press [STOP II], select
"Yes" with [A/V], then press [OK]. Finalizing is
canceled and the unit will be in stop mode.
If (_ appears when pressing [STOP II], you cannot
cancel finalizing because the finalizing has been in
certain progress.
When selecting "No" and press [OK] or [RETURN],
finalizing will be continued.
You cannot cancel finalizing the DVD+R/DVD-R once
it has started.
Finalizing is completed.
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