ANSWERS: 2
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Sometimes computer manufacturers label their DVD burners (+/-) to refer to read capability only. What is the exact model of Dell you bought? If you present it in the comments, we can prove that one way or the other.
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There are physical differences between the plus and minus formats, and earlier DVD writers may not support both formats. DVD-R actually has small registration marks on the blank discs, which DVD+R does not use.
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