For several times I thought the Xinix LS-300 CD repair/cleaning machine was nothing more than a soundless CD player after I tried to repair some of my scratched discs.
Perhaps it's because this DVD disc a friend asked me to copy for him is merely slightly scratched or lightly tainted. After applying a little more of the repair solution to the kit, out of my expectation, the copying process was completed! without the data error message about cyclic redundancy check.
I supposed this tool is useful after all.