From iPods, to high-definition movies, to PS3 Games, much of today's technology would be impossible without the capability to store huge amounts of data in a compact form. The advancement of data storage has been staggering:
* Hard Drives now have a capacity of more than 270,000 times that which they were introduced with. (3.75MB to 1TB+)
* Magnetic tape could only hold 128 bits per inch when first introduced. While magnetic tape is still used in business, many of its consumer functions have been replaced by other data storage mediums.
* For discs, floppies could hold up to 200MB, CD-ROMs up to 800MB, and DVDs up to 1.5GB per layer per side. Today, Blu-Ray Discs hold up to 25GB per layer.
A major factor in the Blu-Ray's enormous capacity is the use of a blue-violet laser for reading and writing, as opposed to the red laser traditionally used by DVDs. Blue-violet light has a much shorter wave length, allowing for great precision when focusing the laser, and thus making it possible to pack data into a tighter space. Pioneer has pushed storage capacity to 500GB on a single Blu-Ray disc by using 20 layers.
Why does this additional storage matter, you ask? For one, PS3 games would have no chance of fitting onto a DVD while maintaining the performance that gamers demand. You would have to stack so many layers that reading the data would be hampered and performance lost, or spread the game across two or more discs, which has its own host of problems.
Blu-Ray is not the only format that was competing for the spot as the standard HD disc format. HD DVD fought with Blu-Ray for several years before ultimately failing when Toshiba dropped the format and stopped producing players. HD DVDs also utilized a blue laser for reading/writing, much like Blu-Rays; however, HD DVDs were only able to achieve 15GB per layer.
Some people say Toshiba's decision to drop HD DVD and leave Blu-Ray as the standard HD disc format was influenced by Sony's PS3 release, which uses Blu-Ray for all games and can play Blu-Ray HD movies as well. Toshiba's decision was made approximately two years after the release of the PS3, which was experiencing wide-spread adoption, though the console struggled at launch due to its high price tag and low availability. Many people began buying PS3s simply for use as a Blu-Ray player.
Both Blu-Rays and PS3 games have had an interesting and intertwined past. The success of each has been at least somewhat reliant on the other.
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