04-03-2011, 09:26 AM
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abstract:
Blue-ray disc (BD) is a next generation optical disc format meant for storage of high definition video and high –density data. As compared to the HDVD format, its main competitor, Blu-ray has more information capacity per layer, 25 instead of 15 gigabytes. Blu-ray dics not only have more storage capacity than traditional DVDs, but they also offer a new level of interactivity. Users will be able to connect to the internet and instantly download subtitles and other interactive movie features.
Blu-ray gets its name from the shorter wavelength (405 nm) of a “blue” (technically blue-violet) laser that allows it to store substantially more data than a DVD, which has the same physical dimensions but uses a longer wavelength(650 nm red laser).
There are plans for BD-ROM (read only), BD (recordable) and BD-RE (rewritable) drives for PCS and with the support of the manufacturers, it’s very likely that the technology will be adopted as the next-generation optical disc format for PC data storage and replace technologies such as DVD+-R, DVD+-RW, and DVD+-RAM.
INTRODUCTION TO BLUE-RAY DISC
A current, single-sided, standard DVD can hold 4.7 GB (gigabytes) of Information. That's about the size of an average two-hour, standard-definition movie with a few extra features. But a high-definition movie, which has a much clearer image (see how Digital Television Works), takes up about five times more bandwidth and therefore requires a disc with about five times more storage. As TV sets and movie studios make the move to high definition consumers are going to need playback systems with a lot more storage capacity. Blu-ray is the next-generation digital video disc. It can record, store and play back high definition video and digital audio, as well as computer data.
The advantage to BIu-ray is the sheer amount of information it can hold:
• A single-layer BIu-ray disc, which is roughly the same size as a DVD, can hold up to 27 GB of data that's more than two hours of high-definition video or about 13 hours of standard video.
• A double-layer Blu-ray disc can store up to 54 GB, enough to hold about 4.5 hours of high-definition video or more than 20 hours of standard video ..
ADVANTAGES OF BLU_RAY DISC:
• Record High-Definition Television (HDTV) without any quality loss.
• Instantly skip to any spot on the disc.
• Record one program while watching another on the disc
• Create play lists.
• Edit programs recorded on the disc.
• Automatically search for an empty space on the disc to avoid recording over a program.
• Access the web to down load subtitles and other extra features
WORKING OF BLU_RAY:
Discs store digitally encoded video and audio information in pits spiral grooves that run from the center of the disc to its edges. A laser reads the other side of these pits the bumps to play the movie or program that is stored on the DVD. The more data that is contained on a disc, the smaller and more closely packed the pits must be. The smaller the pita (and therefore the bumps), the more precise the reading laser must be.
Unlike current DVD’s, which use a red laser to read and write data, Blu-ray uses a blue laser (which is where the format gets its name). A blue laser has a shorter wavelength (405 nanometers) than a red laser (650 nano meters). The smaller beam focuses more precisely, enabling it to read information recorded in pits that are not only 0.15 microns long this is more than twice as small as the pits on a DVD.Plus, Blue-ray has reduced the track pitch from 0.74 microns to 0.32 microns. The smaller pits, smaller beam and shorter track pitch together enable a single-layer Blu-ray disc to hold more than 25GB of information about five times the amount of information that can be stores on a DVD.
abstract:
Blue-ray disc (BD) is a next generation optical disc format meant for storage of high definition video and high –density data. As compared to the HDVD format, its main competitor, Blu-ray has more information capacity per layer, 25 instead of 15 gigabytes. Blu-ray dics not only have more storage capacity than traditional DVDs, but they also offer a new level of interactivity. Users will be able to connect to the internet and instantly download subtitles and other interactive movie features.
Blu-ray gets its name from the shorter wavelength (405 nm) of a “blue” (technically blue-violet) laser that allows it to store substantially more data than a DVD, which has the same physical dimensions but uses a longer wavelength(650 nm red laser).
There are plans for BD-ROM (read only), BD (recordable) and BD-RE (rewritable) drives for PCS and with the support of the manufacturers, it’s very likely that the technology will be adopted as the next-generation optical disc format for PC data storage and replace technologies such as DVD+-R, DVD+-RW, and DVD+-RAM.
INTRODUCTION TO BLUE-RAY DISC
A current, single-sided, standard DVD can hold 4.7 GB (gigabytes) of Information. That's about the size of an average two-hour, standard-definition movie with a few extra features. But a high-definition movie, which has a much clearer image (see how Digital Television Works), takes up about five times more bandwidth and therefore requires a disc with about five times more storage. As TV sets and movie studios make the move to high definition consumers are going to need playback systems with a lot more storage capacity. Blu-ray is the next-generation digital video disc. It can record, store and play back high definition video and digital audio, as well as computer data.
The advantage to BIu-ray is the sheer amount of information it can hold:
• A single-layer BIu-ray disc, which is roughly the same size as a DVD, can hold up to 27 GB of data that's more than two hours of high-definition video or about 13 hours of standard video.
• A double-layer Blu-ray disc can store up to 54 GB, enough to hold about 4.5 hours of high-definition video or more than 20 hours of standard video ..
ADVANTAGES OF BLU_RAY DISC:
• Record High-Definition Television (HDTV) without any quality loss.
• Instantly skip to any spot on the disc.
• Record one program while watching another on the disc
• Create play lists.
• Edit programs recorded on the disc.
• Automatically search for an empty space on the disc to avoid recording over a program.
• Access the web to down load subtitles and other extra features
WORKING OF BLU_RAY:
Discs store digitally encoded video and audio information in pits spiral grooves that run from the center of the disc to its edges. A laser reads the other side of these pits the bumps to play the movie or program that is stored on the DVD. The more data that is contained on a disc, the smaller and more closely packed the pits must be. The smaller the pita (and therefore the bumps), the more precise the reading laser must be.
Unlike current DVD’s, which use a red laser to read and write data, Blu-ray uses a blue laser (which is where the format gets its name). A blue laser has a shorter wavelength (405 nanometers) than a red laser (650 nano meters). The smaller beam focuses more precisely, enabling it to read information recorded in pits that are not only 0.15 microns long this is more than twice as small as the pits on a DVD.Plus, Blue-ray has reduced the track pitch from 0.74 microns to 0.32 microns. The smaller pits, smaller beam and shorter track pitch together enable a single-layer Blu-ray disc to hold more than 25GB of information about five times the amount of information that can be stores on a DVD.
