Difference Between DVD and BlueRay Disc?

They Are types of optical storage discs, commonly used for storing movies and other video. Although the discs look similar, there are significant differences. The difference between a DVD player and a Blu-ray player is the laser technology that's used to record and play back the data. A Blu-ray player can play most DVDs; however, a DVD player cannot play Blu-ray discs. DVDs Digital Video Discs (DVDs) were developed in the 1990s, and came to market in the second half of the decade. Information is written to a DVD with a 650 nanometer (nm) red laser, which creates microscopic bumps in a groove on the disc. A DVD player contains a laser which can read the bumps in the spiral track of data. The most common type of disc can hold 4.7 GB of data. The quality of audio and video recorded on a DVD is very high; in most cases, video is encoded in MPEG-2 format, which offers high definition, 720 pixel resolution. Surround sound options are also often available. Many DVDs also include interactive menus, additional audio tracks, and other special features. Blu-ray The Blu-ray player was introduced in 2006. Information is written on a Blu-ray Disc™with a 405 nm blue laser — giving the technology its name. This laser produces a tightly focused beam, and is capable of burning more data than a red laser into the same size space; a standard Blu-ray Disc can hold 50 GB. Commercial audio and video is typically encoded in a proprietary format called Blu-ray Disc Movie (BDMV), although there are other formats. Difference Between DVD's and Blu-Ray?? The quality of the video on Blu-ray is higher than that on a DVD; in most cases, the resolution is 1080p. In addition, the way the video is compressed on the disc is better, which contributes to a better image. The quality of the audio on Blu-ray™ is essentially studio-quality. Like DVDs, Blu-ray Discs™ usually include interactive menus, multiple audio tracks, and other special features. This features are often more advanced than DVDs can offer, and include things like pop-up menus and picture-in-picture commentary. DVD vs. Blu-ray

In terms of quality, Blu-ray™ can produce higher resolution video and higher quality audio than DVD. It also offers more special and interactive features. If linked to the Internet, a Blu-ray™ player can also be upgraded, and allow the user to download extras and connect to online audio and video services. To get the most out of Blu-ray™, a consumer really needs a high definition television (HDTV) capable of displaying 1080p video, an excellent speaker system, and an Internet connection. Although HDTV has become very popular, many people still own standard definition televisions that cannot display Blu-ray™ at its best. All of this technology is also relatively expensive, although prices are dropping. DVDs became very popular very quickly, and as a result, players and discs are found in a majority of homes in the US and other nations. As a result, it's unlikely that DVDs will simply disappear in the same way that HD DVDs did. Most Blu-ray™ players can also play DVDs, so someone looking for a new machine will still be able to play his or her older discs. DVD players cannot play Blu-ray™ titles, making them a less attractive choice for many buyers. AdChoices

What Is CRDI??

Modern diesels owe their resurgence in popularity to advances in fuel delivery and engine management systems that allow the engines to return power, performance and emissions equivalent to their gasoline counterparts, while simultaneously producing superior fuel economy. It's the high pressure fuel rail and the computer controlled electronic injectors that make all the difference. In the common rail system, the fuel pump charges the fuel rail at a pressure of up to 25,000 psi--but unlike indirect injection pumps--it is not involved in fuel discharge. Under the control of the onboard computer, this fuel quantity and pressure accumulates in the rail independently of engine speed and load. Each fuel injector is mounted directly above the piston within the cylinder head (there is no pre-chamber) and is connected to the fuel rail by rigid steel lines that can withstand the high pressure. This high pressure allows for a very fine injector orifice that completely atomizes the fuel and precludes the need for a pre-chamber. The actuation of the injectors comes via a stack of piezo electric crystal wafers that move the jet needle in tiny increments allowing for the spray of fuel. Piezo crystals function by expanding rapidly when an electric charge is applied to them. Like the fuel pump, the injectors are also controlled by the the engine computer and can be fired in rapid succession several times during the injection cycle. With this precise control over injector firings, smaller, staggered quantities of fuel delivery (5 or more) can be timed over the course of the power stroke to promote complete and accurate combustion. In addition to timing control, the short duration, high pressure injections allow a finer and more accurate spray pattern that also supports better and more complete atomization and combustion. Through these developments and improvements, the modern common rail direct injection diesel engine is quieter, more fuel efficient, cleaner, and more powerful than the indirect mechanical injection units they have replaced.