BD and DVD both have pits and bumps. The difference between the two is that the BD pits and bumps are smaller and packed closer together. A blue laser is used to read the BD. The BD has spiral tracks running from the center of the disc out to the edges. The information is stored in these tracks in the form of audio and video. The blue laser used to read this information has a wavelength of approximately 405 nanometers and must be much more accurate than that of a DVD as the pits and bumps are smaller and closer together.
Figure 2: Different lasers reading a DVD and BD.
Figure 2 present an image of a DVD and a BD. As can be seen on the DVD, the pits and bumps are larger and so the laser is less accurate than that of the BD. Blu-Ray disc can run formats that are encoded in MPEG-4 and MPEG-2. BD is also used for data storage, playing 1080p HD video and audio, 3-D Stereophonic and it has many other uses.
The DVD player is not only used for playing the data present in a DVD, but also to write the content onto a DVD. As told earlier, a DVD has pits and bumps like a BD in its tracks which hold information. This information can be a video, audio or mixture of both. When a DVD player reads this data, the smooth surface of the disk is taken as “0” and the pits are read as “1”. It reads the DVD and converts the data to binary code. Unlike a BD, a DVD uses a red laser with a wavelength of roughly 600 nanometers. This is 180 nanometers less than a CD however 200 more than a BD. This enables it to have a higher density of pits and bumps than a CD but less than a BD. Originally only single layer DVDs were released but then double layer discs were later released. Single layer discs can hold up to 4.7 GB of data and double layered discs can hold up to 17 GB of data. A DVD does not have the capacity to hold hi-def movies. So a MPEG-2 compression system is introduced. As this is used, the data will be encoded onto the DVD as elements of the changing frames. This has to be successfully decoded and decompressed by the DVD player.
Blue screen is sometimes known as chroma–key which refers to a television process. Ultimatte a manufacturer is also an exclusive process that produces a high quality blue screen image. Using Ultimatte it is possible to add subtle effects like mist or haze to an image using software like Photo Shop and Aftereffects.
Since 1999 the growth of spending on DVD purchases and rentals has been incredible. According to Alexander & Associates, “Rapidly growing consumer activity and spending has built this industry into a major market phenomenon. The DVD format for enjoying pre-recorded entertainment at home is extraordinarily popular and consumers are changing their behavior to accommodate it.”
2X CD-ROM drive: This CD-ROM drive can transfer data from the CD-ROM at 300 KB per second while using less than 40% of the CPU bandwidth and has an average seek time of less than 400 milliseconds.
A. DVD discs utilize digital technology, which is the same technology used by compact discs.
A Blu-ray disk is the exact same size as a DVD. When holding the two disks side by side, it would be impossible to differentiate between them. Although relatively new, Blu-ray is currently supported by about 200 of the world's leading consumer electronics, including Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony, TDK and Thomson, along with recording media, video game and music companies. The most prominent difference between DVD and Blu-ray is their available storage space. According to the Blu-ray Disk Association, a Blu-ray is an...
Watching movies has developed into a form of enjoyment for individuals, and families in today’s society. Going to a cinema to watch a movie or watching a movie at home both offers a fulfilling experience; despite the fact the two differ in terms of their overall entertainment, quality, and cost.
A Worldwide Problem Software piracy is defined as the illegal copying of software for commercial or personal gain. Software companies have tried many methods to prevent piracy, with varying degrees of success. Several agencies like the Software Publishers Association and the Business Software Alliance have been formed to combat both worldwide and domestic piracy. Software piracy is an unresolved, worldwide problem, costing millions of dollars in lost revenue. Software companies have used many different copy protection schemes. The most annoying form of copy protection is the use of a key disk. This type of copy protection requires the user to insert the original disk every time the program is run. It can be quite difficult to keep up with disks that are years old. The most common technique of copy protection requires the user to look up a word or phrase in the program's manual. This method is less annoying than other forms of copy protection, but it can be a nuisance having to locate the manual every time. Software pirates usually have no trouble "cracking" the program, which permanently removes the copy protection. After the invention of CD-ROM, which until lately was uncopyable, most software companies stopped placing copy protection in their programs. Instead, the companies are trying new methods of disc impression. 3M recently developed a new technology of disc impression which allows companies to imprint an image on the read side of a CD-ROM. This technology would not prevent pirates from copying the CD, but it would make a "bootleg" copy differ from the original and make the copy traceable by law enforcement officials (Estes 89). Sometimes, when a person uses a pirated program, there is a "virus" attached to the program. Viruses are self-replicating programs that, when activated, can damage a computer. These viruses are most commonly found on pirated computer games, placed there by some malignant computer programmer. In his January 1993 article, Chris O' Malley points out that if piracy was wiped out viruses would eventually disappear (O' Malley 60). There are ways that a thrifty consumer can save money on software without resorting to piracy. Computer companies often offer discounts on new software if a person has previously purchased an earlier version of the software. Competition between companies also drives prices low and keeps the number of pirated copies down (Morgan 45). People eventually tire or outgrow their software and decide to sell it.
The Cowon V5 32 GB MP3 Player (Black) is superbly built with a hard rock casing. It has 32GB of raw space which can be used for 9500 songs or 25 hardcore action movies. Apart from all the moving data you can even store 320,000 images. Yes the Cowon V5 32 GB MP3 Player (Black) has distinctive features which are rare in an mp3 player. The Cowon V5 32 GB MP3 Player (Black) has a 4.8inch wide screen which can be used for viewing HD movies. The display is of 800X400 pixel resolution type with 16million WVGA colors. The Cowon V5 32 GB MP3 Player (Black) also has a HDMI port which can be used when you wish to view movies on the big screen. The mp3 player has BBE+ support which is a must for today’s data. The Cowon V5 32 GB MP3 Player (Black) comes with a one year warranty which can be used when the equipment needs an upgrade.
Back in the nineties, CDs were only a dream; they could only hold a small amount of data and that wasn't much (Bajarin pg.65). Many years went by before the DVD came out as a way to support distribution of movies (Bajarin pg.65). The direction that digital video was headed, it had to be changed even though the internet was only an idea because of the high demand of cable and tv channels (Bajarin pg.65). Now days, major networks are adding onto the internet and using iTunes and the Google store to be able to download shows and their channels become better every month (Bajarin pg.
and next to the disc is an infrared LED and an infrared sensor. As the
...s. This tool, the dcfldd command, works similarly to the dd command but has many features designed for computer forensics acquisitions. The following are important functions dcfldd offers that aren’t possible with dd:
Copy protection comes in many forms. Its primary purpose is to prevent a person from making a perfect copy of the original. Since the creation of CD burners this technology allows copyright owners to prevent someone from making copies of their intellectual property and either giving them away for free or selling them at a cheaper price without paying royalties to the copyright owner.
As a DVD rental company, the most valuable assets of Quickflix are its physical goods, the DVDs. These plastic chips are storing in Quickflix's warehouse, and will be delivered by POST once it has been put on the list.
one will begin to see more and more documents being on CD-ROM and also on the
Buffer under-un. This is also called buffer underflow. It is when the computer supplies data to the CD writer slower than required i.e. the buffer between two processes is supplied to data slower than that being read from it.it occurs for example when a CD does not have enough memory space to accommodate the data being transferred. This can be avoided by increasing the data buffer size.