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Pits on both layers of the DVD-9 layers are 10% longer than on a DVD-5 or DVD-10 disc.
DVD X Copy Gold can compress a DVD-9 to a DVD-5, fitting each backup copy onto one single DVD R or DVD RW.
In addition, DVD X Copy XPRESS can compress a DVD-9 to a DVD-5, fitting each backup copy onto one single DVDR or DVDRW.