DVD (Digital Versatile Disk)(page 4)

• Introduction
• DVD Formats
• DVD Configurations and Basic design
• DVD-R and DVD-RW or RAM
• DVD-ROM
• DVD-Video and DVD-Audio
• Red laser vs. Blue laser
• DVD--> VHS
• DVD--> DVD
• DVD R/RW Format Compatibility
• White Papers

A further improvement on CDs - a double-sided disk design is introduced in DVD-10 and DVD-18. DVD-10 is made of two metalized substrates with fully reflective layers bonded together. The binder does not need to be transparent because the data is read by the laser beams from both sides of the disk.  This type of disk is much more difficult to make.  Also, there is no place for a conventional label, which is now restricted to an area within the disk hub on both sides of the disk. Finally, since half of the data is on the second side of the disk, it requires either flipping the disc or having a DVD drive / player capable of two-sided playback. One obvious advantage of this design is the doubled capacity of 9.4 GB (compare to DVD-5), but almost the same value could be achieved using a one-sided DVD-8 design.

DVD-18 disks are made of two  substrates bonded together each having two data layers and allowing double-sided data retrieval.  This design is even more complex than that of DVD-10, and shares all the advantages and disadvantages of DVD-10.

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