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Probably the RW disc has some problems.
Try the following method.
Install ImgBurn (free software) and run it. Select the “Write mode”, and then insert the RW disc on the drive.
Finally press the little button shown in picture and select “FULL erase”. At the end of the erasing, try again to burn the disc. Some times this method works to recover the rewritable disc
Another possibility is that your drive needs a firmware update, because the disc cannot be recognized by the currently installed firmware. in this case, check at Dell website if an update is available