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The Sony 4GB Memory Stick has a Write Speed of up to 32Mbps When combined with optimized Memory Stick PRO format-compatible devices.

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• Product Dimensions: 5 x 1 x 7 inches ; 1 pounds
• Shipping Weight: 1 pounds
• Shipping: Currently, item can be shipped only within the U.S.
• ASIN: B0013AX2JM
• Item model number: MSMT4G

The name Blu-ray Disc derives from the blue-violet laser used to read the disc. While a standard DVD uses a 650 nanometre red laser, Blu-ray uses a shorter wavelength, a 405 nm blue-violet laser, and allows for almost six times more data storage than a DVD.

During the format war over high-definition optical discs, Blu-ray competed with the HD DVD format. Toshiba, the main company supporting HD DVD, ceded in February 2008, and the format war ended;[2] in July 2009, Toshiba announced plans to put out its own Blu-ray Disc device by the end of 2009.

Blu-ray Disc was developed by the Blu-ray Disc Association, a group representing makers of consumer electronics, computer hardware, and motion pictures. As of June 2009, more than 1000 Blu-ray disc titles are available in Australia, 2500 in Japan, 1500 in the United Kingdom, and 2500 in the United States and Canada.