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The best way to ensure that there is no data remanence of sensitive information that was once stored on a DVD-R media is by
Deletion
Destruction
Overwriting
Degaussing
Optical media such as CDs and DVD must be physically destroyed to make sure that there i s no residual data that can be disclosed. Since the media mentioned in this context is a read-only media (burn-once) DVD, the information on it cannot be overwritten or deleted. Degaussing can reduce or remove data remanence in magnetic non-optical media.
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