Blu Ray Disc Theory
Theory:
All optical storage included compact disc, digital video disc and blue ray disc operate base concept of reflection of the laser from the data carve on the disc at which binary data are stored as the pits. This three kind of optical storages are difference from the kind of laser beam they used, disc construction, data format.
Unlike CD and DVDs, which use a red laser to read and write data, Blu-ray uses a blue laser. A blue laser has a shorter wavelength (405 nanometers) than a red laser (650 nanometers). The
smaller beam focuses more precisely, enabling it to read information recorded in pits that are only 0.15 microns (µm) (1 micron = 10-6 meters) long — this is more than twice as small as the smaller pits, smaller beam and shorter track pitch together enable a single-layer Blu-ray disc to hold more than 25 GB of information — about five times the amount of information that can be stored on a DVD.
In this section we will discuss about laser ray production, material used in the blue ray disc and theory of functional of blue ray writer and reader Read more
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Dell introduced new laptop: 19h on batteries
The demands of the digital nomad are expected to drive laptop sales to over one billion in the next five years. 
The prediction by Dell came as it unveiled 10 new laptop models aimed at this emerging working class. The new Latitude line boasts as much as 19 hours of battery life for the always connected 21st century worker. At a press launch in San Francisco, Jeff Clarke, senior vice president of Dell’s business group, showed off the new line to reporters and analysts. The laptops include seven Latitude business laptops and three Dell Precision workstation laptops which Mr Clarke described as “performance leaders and something the tech community will absolutely die for”.
What Dell hopes will be particularly appealing to travelers is the 12.1-inch Latitude E4200, which starts at 2.2 pounds; and the 13.3-inch E4300, which starts at 3.3 pounds. For companies looking for a basic business notebook to reduce costs, Dell unveiled the 14.1-inch E5400, which starts at $839, and the 15.4-inch E5500, which starts at $869. The systems were available Tuesday. For mainstream desktop replacements, often found in docking stations in corporate cubicles, Dell introduced the 14.1-inch E6400 and the 15.4-inch E6500, which start at $1,139 and $1,169, respectively. Both were also available as of Tuesday. The computers have just under 10 hours of battery life which can be extended with a so called “battery slice” to total 19 hours. The machines also have a fingerprint reader and a “control vault” processor that stores an owner’s identity and credentials on protected hardware.
Buffalo launch first 8x Blu-Ray burner
Next month our Japan-based readers will be able to get their mits on Buffalo’s latest Blu-Ray burners, the BR-816SU2, BR-816FBS-WH and BR-816FBS-BK, all of which are capable of writing to Blu-Ray disks at a speed of 8x. First up is the BR-816SU2, an external USB 2.0/eSATA unit capable of writing to your single layer BD-R at the lightening fast speed of 8x when connected through its eSATA interface. Using the USB 2.0 connector you’ll still be able to achieve 6.5x. The BR-816FBS black and white units are internal burners and have a SATA connection allowing the same 8x speeds. Speeds for other disk types are as follows
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