| |
| |
|
Hardware Information |
|
|
|
DVD Media
DVD is an optical disc storage media format that can be used for storing data, including movies with high video and sound quality. DVDs resemble compact discs: their physical dimensions are the same-12cm or the mini 8cm-but they are encoded in a different format and at a much higher density. Unlike CDs, all DVDs must contain a file system. This file system is called UDF, and is an extension of the ISO 9660 Standard used for Data-CDs. DVDs are made from a 0.6 mm thick disc of polycarbonate plastic coated with a much thinner (reflective) aluminium layer. Two such discs are glued together to form a 1.2 mm double-sided disc. The basic DVD disc is thinner than a CD to make it possible to use a lens with a higher numerical aperture. A single-layer DVD can store 4.7 Gbyte, which is around seven times more than a standard CD-ROM. By employing a read laser at 650 nm (was 780 nm) wavelength and a numerical aperture of 0.6 (was 0.45), the read-out resolution is increased by a factor 1.65. This holds for two dimensions, so that the actual physical data density increases by a factor of 3.5. DVD uses a more efficient coding method in the physical layer. CD's error correction, CIRC, is replaced by a powerful Reed-Solomon product code, RS-PC; Eight-to-Fourteen Modulation (EFM) is replaced by a more efficient version, EFMPlus, which has the same characteristics as classic EFM. The CD subcode is removed. As a result, the DVD format is 47% percent more efficient with respect to CD-ROM, which uses a 'third' error correction layer. DVD Media can contain: Two DVDs with different bottom sides.The disc may have one or two sides, and one or two layers of data per side; the number of sides and layers determines the disc capacity. DVD-5: single sided, single layer, 4,704,317,440 bytes, 4.7 gigabytes (GB), or 4.38 gibibytes (GiB) DVD-9: single sided, double layer, 8.5 GB (7.92 GiB) DVD-10: double sided, single layer on both sides, 9.4 GB (8.75 GiB) DVD-14: double sided, double layer on one side, single layer on other, 13.3 GB (12.3 GiB) DVD-18: double sided, double layer on both sides, 17.1 GB (15.9 GiB) The capacity of a DVD-ROM can be visually determined by noting the number of data sides, and looking at the data side(s) of the disc. Double-layered sides are usually gold-colored, while single-layered sides are silver-colored, like a CD. One additional way to tell if a DVD contains one or two layers is to look at the center ring on the underside of the disc. If there are two barcodes, it is a dual layer disc. If there is one barcode, there is only one layer. Each medium can contain any of the above content and can be any layer type. Double layer DVD+R discs are already on the market. Provider Info: Profile about DVD Media(http://www.cdrdvdrmedia.com) Cn Rambler
MORE RESOURCES:
Audio-Streaming - Google News |
|
|
|
RELATED ARTICLES
What Is A Fuse? And How To Test It. A fuse is a very thin wire, which either melts or vaporizes when too much current flows through it. The thin wire may be made of aluminum, tin-coated copper or nickel. At War With The Internet When it comes to sales of technology products over the Internet, there are now two factors that potential buyers must consider as possibly 'too good to be true'. In the past, there was only price to worry about. Printer Ink Cartridges - The History You are working at your computer and trying to print out important documents and all at once you find you are out of ink. Years ago that would have presented a big problem. How To Troubleshoot DVD Drives Fast You really enjoy those dvd movies and games and the last thing you need or want is to experience problems with your dvd drive.To prepare for the possibility of having your dvd drive leaving you out in the cold one morning,we will dicuss problems that may cause dvd failure as well as the procedures you should take to correct these problems. Facing DVD Software Dilemma? Its Brainlessly Simple 1. Pocket DVD Wizardhttp://www. What Everybody Should Know About An Inkjet Printer: The One-Year Cost Of Printing You can purchase an inkjet printer for as little as $39. With a rebate, it may even be less. 7 Steps to Cleaning the Laser Toner From Your Laser Printer Cleaning a laser printer, fax, or copier of laser toner canbe easy, provided you know what you're doing and use theright tools. This article will share with you some simpletips to help you clean your laser printers of laser tonerlike a pro. ESR Meter - The Capabilities To Check Beyond Electrolytic Capacitor There is something good about esr meter because besides electrolytic capacitor it can be use to measure other type of capacitors such as the non polarity capacitor. From esr meter specification, it is usually mentioned only checking the electrolytic type. The Importance of Ergonomic Products Interestingly, ergonomics though sounds to be a modern and trendy phenomenon, its principles are based on primitive life style. It is a known fact that earlier generations did not have to face a whole lot of medical complications that our generation is facing. 10 Solid Reasons To Make Your Next PC A Notebook Notebook computers are becoming very popular. They seem to be popping up everywhere: on tv shows, on airplanes,in movies, or in your friend's lap. Digital Camera Prints - Getting the Most for Your Money Digital cameras have really taken off in popularity in recent years. It's not uncommon anymore to see several people at an event with a digital camera. A Review of Samsung Laser Toners Samsung laser toner is just as popular as its Hewlett-Packard and Brother counterparts. Samsung is a group of products and services that began in Korea in 1938. A Review of Refurbished Toshiba Laptops Toshiba offers a few of their refurbished laptops in the "Clearance Store" of their official website toshibadirect.com. How To Refill Your Ink Cartridge Forget about emptying your wallets every time you see the blinking light. Quit worrying and start doing it yourself! It's an easy process that won't take you more than five minutes. Buying / Selecting Computer Components This is the step takes the most time and consideration. Which parts do I buy? Which are best?There are many good places to buy computer parts. Quality Recovery and Rework - When It All Goes Wrong When Quality is the Target, but not the Result, what do you do?While Quality may be the overarching goal of all production, stuff happens, resulting in non-conforming parts. This results in failure verification, rework, recalls, sorting, kitting, retest, relabeling and pipeline management, which are facts of life in the manufacturing, assembly and production world we live in. Review of Logitech Computer Speakers When it comes to computer speaker systems, you have a lot of choice. However, there are simply some brands that stand way out in terms of sound quality and dependability, and one of those brands is certainly Logitech. RAM - What is It & Why You Need Plenty This is the first article in the Understanding Your Computer series from aworldofhelp.com. Surge Protector: A Simple Mechanism Description A surge protector [AKA surge suppressor] is an electrical plug-in device designed to distribute safe electrical voltages to other electrical or electronic devices. Surge protectors resemble power strips in appearance; however, they are more sophisticated and deliver a constant, continuous power supply. Getting The Proper Laptop Screen Size Are you sick of viewing everything on that small screen that your current notebook comes with? Do you want your next laptop to have screen size that you are more comfortable with? Well read on.In this article we will take a look at all the common screen sizes found on the many various laptops currently in existence, as well as which ones may be best for you and why.
|
|
|
Top of Page home | site map home Bookmark Us Now ctrl+d 1st 4 Games, shopping via this site cost no more than going direct and can often save you money with special offers. |
