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Rsdl
RSDL stands for "Reverse Spiral Dual Layer". An RSDL disc uses two layers of information stored on opposite sides of a DVD disc; both of which can be read from only one side of the disc. The DVD player reads the first layer (layer 0) from the center of the disc out. When the laser approaches the outer edge of the disc, it changes focus onto the second layer, and begins to read the second layer (layer 1) from the disc's outer edge toward the center of the disc. RSDL discs permit much more information to be stored on one 'side' of a DVD, allowing longer films to play uninterrupted, and higher video bit-rates to be used. When a DVD player changes layer, there may be a slight pause as the player finds the beginning of the second layer. The first RSDL disc released in North America was Artisan's Terminator 2: Judgment Day.
