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Owning physical media like CDs, DVDs, and Blu-rays sometimes requires a bit of care and attention . If you've been clumsy with your collection over the years, many of your discs may have accumulated marks and scratches. Likewise, if you bought some of them used, they may have come with imperfections on some of their playing surfaces. If that's the case, you might want to consider using a disc repair machine or manual kit. They work by gently smoothing and polishing the disc's clear plastic surface above the data layer, removing a very thin layer of material to reduce the scratches and scuffs. But does the process really work? Well, it seems that some disc cleaners can indeed reduce light scratches and scuffs, but deeper scratches and other forms of damage can be harder to deal with.…