Unreadable disk error
The laser in 5101 could be defective or maybe just dirty.Try cleaning with a commercial cleaning disc,put a drop of rubbing alcohol on cleaning brushes.When this happens sometimes it will still be a usable disc but not always.Try putting in another dvd player or recorder or your PC if it plays dvds,the readers in PC are of a better quality and will often read discs that those cheap dvd readers can't.
R+ or R- discs need to finalized after recording RW+and RW- discs do not.It is always a good policy to finalze the second your recording is finished otherwise it may not play in other players or recorders.
When you make a recording in a dvd recorder an it doensn't recognize the disc it just recorded it quite often has a defective laser.This particular model has been plagued with early laser failure.
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