LG RH7521W Service Manual page 81

In case of writing fail.
Normal Case
Check the media
DVD ±R/RW?
YES
Does the disc
have any dust,scratch,
fingerprint ...?
Finalized Disc?
YES
If DVD ±R disc,use new DVD ± R disc.
If DVD ±RW disc,erase the disc.
NO
YES Remove the dust,fingerprint and
if the disc has long width scratch,
change it.
NO
Go to "Writing Part Check".
Check disc label.
Eject disc.