Blu-Ray set to take the world by storm!

The Blu-ray Disc belongs to a new generation of optical discs capable of staging high density data. Blu-Ray technology is based on a blue-violet coloured laser. The blue laser operates at a wave length of 405 nm, while older technology such as DVDs and CDs are based on red and infrared lasers that works at 650 and 780 nm. Since the wave length is shorter with a blue laser, the new Blu-ray technology makes is possible to store much more information

The advantage with the Blu-ray technology is that the laser beam can be focused much more tightly at the surface of the disc. Tight focus means that a smaller spot will be produced on the surface on the disc, and when the spots become smaller there will naturally be room for more information on each disc. The minimum spot size of any laser depends on a naturally accruing phenomenon called diffraction. The narrow beam of light sent out from a laser will always diverge into a wider beam eventually, due to the natural diffraction of waves. Diffraction will also occur the waves meet an obstruction. By reducing the wavelength of a laser, we can affect the diffraction.

In Blu-ray technology, the diffractions is also affected by the fact that the lens used to focus the light has a higher numerical aperture than the lenses found in ordinary DVDs - 0.85 instead of 0.6. Blu-ray technology based appliances are also equipped with a dual-lens system of supreme quality, and the cover layer has been made thinner in order to prevent unwanted optical effects. All this makes it possible for a Blu-ray laser to focus on much smaller spots. The optical improvements are accompanied with a new method for encoding data which makes it possible to store even more data on the Blu-ray disc.

The standard for Blu-ray technology has been developed as a joint venture between several major manufacturers of PCs and consumer electronics, including Sony and Philips. The group is called the Blu-ray Disc Association (BDA). The first Blu-ray recorder was launched in Japan in 2003, by Sony. Today, Samsung, JVC, Matsushita (Panasonic) and LG Electronics are all examples of companies using Blu-ray technology in their products. Hewlett Packard has announced that they will release desktop PCs equipped with Blu-ray technology in late 2005.

The main competitor for the Blu-ray technology is the HD DVD format which is also capable of storing more information than a normal DVD. The Blu-ray technology does however allow for more information per layer than the HD DVD format – 25 GB compared to 15 GB. The Blu-ray technology will on the other hand most likely be more expensive to support, at least initially, which can make the HD DVD a tempting alternative. In a Blu-ray disc, the data is stored extremely close to the surface. This made the first Blu-ray discs extremely vulnerable to scratching and many users preferred the tougher HD DVD discs. Since 2004, all Blu-ray discs are coated with a clear polymer called "Durabis" which makes them much more durable. According to the developers of Durabis, the TDK Corporation, a coated Blu-ray disc will work even after being attacked with a screwdriver.

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Selecting the Right Laptops

Everyone wants the best for their money spent and a laptop purchase is not an exception. Laptops are very useful to people, as everyone is inclined towards leading a comfortable life. Hence, many prefer a laptop to a desktop computer due to the fact that laptops are easily portable and mobile. It makes the work faster and easier. The benefits got from the laptops are not restricted to businessmen, but can be availed by mothers working from home, research scholars, ordinary employees and students.

Selecting the right kind of laptop is a daunting task as there are so many options available these days. As laptops are costly, it can be disastrous if they are bought without any thought of how they will be used. This calls for the need to research a little bit before buying a laptop.

Valuable information regarding the selection of laptops can be got from the following sources:

Search engines provide all the information regarding laptops, available brands, costs, features and their advantages within a few seconds. They provide information regarding the websites that sell good laptops all over the world.

Forums too provide valuable information if proper thread is followed. There are many people who write lot of informative articles and advice that may be really helpful while selecting a laptop.

Reviews are written by those who have used a product. Such reviews provide an insight on the product and its selection. Mistakes can be avoided if right decision is made by learning from their experience.

Many websites provide description of products, technical details, accessories that can be used along with the product etc. Knowledge is power. Understanding about the product will help in the right selection.

A laptop buying guide can be of great use. Such guides are available free of cost on the Internet or even got for a smaller fee. Since the purchase of laptops involves investing a considerable amount of hard earned money, it is better to got through a laptop guide. These guides help in assisting the customer in selecting the best laptop for him. It contains all the information that is updated at regular intervals making the customer accessible to the latest information and trends in the field of laptops.

Even though there are huge varieties of laptops available, the selection of the laptop by the purchaser should match the need rather than buying through an impulse. Variations may be seen in the laptops depending on the processor speed and other additional features. The purchaser can however increase the memory capacity and other parts of the laptops according to his needs. The expectancy of the internal parts of the laptops may be limited, but if it is got from a reputed manufacturer or if the laptop is of a credible brand, the purchaser can be sure of the quality of the internal parts. The memory capacity requirement of the laptop depends on the operating system used on it. While selecting a laptop some of the essential built in additions needs to be checked are the USB ports, Network port, DVD burner, modem port, Bluetooth and Wireless feature.

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Keeping Your Computer Clean

If your computer is used a lot and keep it on for hours at a time it's a good idea to clean it every now and again, one of the main problems is dust. Cleaning out this dust can extend your computers life and make keep it running faster and quieter.

If you have a desktop computer then the main place dust accumulates is around the CPU unit and fan areas. To prevent your processor from over heating there is a fan connected to a heat sink which sits on top of the processor to disperse the heat. This fan blows air down on to the heat sink to cool it down as the heat is passed up from the CPU. Because the fan is constantly blowing air it also blows the dust particles in the air in to the heat sink, over time this can clog up the computers heat sink reducing its effectiveness. Because of the dust your fan may have to blow faster making it louder and more costly to run. Normally you can see if the fan is clogged up simply by opening your computer up and looking at it. If your fans heat sink is really clogged up with dust and dirty looking it is a good idea to give it a clean. When dealing with the inside of your computer or anything electrical ensure the power is turned off and it is unplugged first.

The best way to clean out the insides of your computer is by using a can of compressed air and special nozzle, you can buy these from any good computer store. The spray nozzle is useful for getting in to those tricky places. When spraying the compressed air on to your computer, make sure you don't spray it for to long as condensation may form some drops of water. After blowing away any dust from your computers heat sinks give it a gentle wipe over with an anti-static cloth. You can also use the compressed air to clean your power unit and keyboard.

Cleaning the inside of your computer doesn't take long providing you have the correct equipment, and once done you notice an immediate improvement in your computers performance. The fan wont need to blow as hard so it will be quieter and thanks to the processor running at a cooler temperature your whole computer should generally run faster. I try to clean my computer every 4 or 5 months to keep it running efficiently

Source : www.readbud.com