Backup your DVDs with Any DVD Shrink

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What happens if I scratch the disc? Aren't discs too fragile to be rented?

 

Scratches may cause minor data errors that are easily corrected. That is, data is stored on DVDs using powerful error correction techniques that can recover from even large scratches with no loss of data. A common misperception is that a scratch will be worse on a DVD than on a CD because of higher storage density and because video is heavily compressed. DVD data density (say that fast ten times!) is physically four times that of CD-ROM, so it's true that a scratch will affect more data. But DVD error correction is at least ten times better than CD-ROM error correction and more than makes up for the density increase. It's also important to realize that MPEG-2 and Dolby Digital compression are partly based on removal or reduction of imperceptible information, so decompression doesn't expand the data as much as might be assumed. Major scratches may cause uncorrectable errors that will produce an I/O error on a computer or show up as a momentary glitch in DVD-Video picture. Paradoxically, sometimes the smallest scratches can cause the worst errors (because of the particular orientation and refraction of the scratch). There are many schemes for concealing errors in MPEG video, which may be used in future players.

The DVD computer advisory group specifically requested no mandatory caddies or other protective carriers. Consider that laserdiscs, music CDs, and CD-ROMs are likewise subject to scratches, but many video stores and libraries rent them. Major chains such as Blockbuster and West Coast Entertainment rent DVDs in many locations. Most reports of rental disc performance are positive, although if you have problems playing a rental disc, check for scratches.

 

Introduction to Any DVD Shrink

Any DVD Shrink is a powerful DVD copy and burning software, which can decode and clone copy-protected movie DVD and non-protected DVDs for you for storage and collections, or burn ISO image and DVD folder on hard drive to DVD and burn DVDs among different DVD discs. It enables you to copy you movie DVDs to hard drive in dvd folder or ISO image file formats, or clone DVD movies from one dvd disc from anther one, even compress DVDs automatically when necessary. It is so easy to use, backup your costly DVDs within a few clicks.