Do any data recovery (for CD/DVDs) progammes work?

If so, which one is the best?
I was transferring data to a DVD-RW disc, which already had data on it, when I had a power cut. Subsequently I lost all the data that was already on the disc. When I put the disc in I can see the data on the disc, but it is ghosted and it cannot be opened.

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data recovery software
Data recovery