10.11. Specialty Disc Formats
Several other odd disc formats appear in record stores: DualDisc, DVD-Audio, and Hybrid SACD. All three contain better sound than regular CDs or DVDs. PCs can't create any of them easily, and can play only one of the three formats. And although they're market failures so far, the industry still pushes the discs for several reasons.
Most of these specialty discs contain releases of older, classic material, making the serious fan part with his money a second (or third) time. To play them at their highest fidelity, most specialty discs require their own players, making more money for player manufacturers. Perhaps most important of all, the discs are much more difficult to copy.
Many new DVD players now support both SACD and DVD Audio, but PC drive manufacturers have been slow to support them. (Besides, you'd need some pretty expensive speakers to be able to hear the difference.)