Optical disks share
a major part among the secondary storage devices.Blu .ray Disc is a next .generation
optical disc format. The technology utilizes a blue laser diode operating at a
wavelength of 405 nm to read and write data. Because it uses a blue laser it can
store enormous more amounts of data on it than was ever possible.
stored on Blu .Ray disks in the form of tiny ridges on the surface of an opaque
1.1 .millimetre .thick substrate. This lies beneath a transparent 0.1mm protective
layer. With the help of Blu .ray recording devices it is possible to record up
to 2.5 hours of very high quality audio and video on a single BD.
ray also promises some added security, making ways for copyright protections.
Blu .ray discs can have a unique ID written on them to have copyright protection
inside the recorded streams. Blu .ray disc takes the DVD technology one step further,
just by using a laser with a nice color.
of Blu ray Disc
When the CD was introduced in the early 80s, it meant an enormous
leap from traditional media. Not only did it offer a significant improvement in
audio quality, its primary application, but its 650 MB storage capacity also meant
a giant leap in data storage and retrieval. For the first time, there was a universal
standard for pre .recorded, recordable and rewritable media, offering the best
quality and features consumers could wish for themselves, at very low costs.
Although the CD was a very useful medium for the recording
and distribution of audio and some modest data .applications, demand for a new
medium offering higher storage capacities rose in the 90s. These demands lead
to the evolution of the DVD specification and a five to ten fold increase in capacity.
This enabled high quality, standard definition video distribution and recording.
Furthermore, the increased capacity accommodated more demanding data applications.
At the same time, the DVD spec used the same form factor as the CD, allowing for
seamless migration to the next generation format and offering full backwards compatibility.
HDTV (High Definition Video)
This high resolution 16:9 ratio, progressive scan format can now be recorded to
standard miniDV cassettes Consumer high definition cameras are becoming available
but this is currently an expensive, niche market. It is also possible to capture
video using inexpensive webcams. These normally connect to a computer via USB.
While they are much cheaper than DV cameras, webcams offer lower quality and less
flexibility for editing purposes, as they do not capture video in DV format. Digital
video is available on many portable devices from digital stills cameras to mobile
phones. This is contributing to the emergence of digital video as a standard technology
used and shared by people on a daily basis.
Moving Picture Experts Group, overseen by the International Standards Organization
(ISO), develops standards for digital video and digital audio compression. MPEG
.1 with a default resolution of 352x240 was designed specifically for Video .CD
and CD .imedia and is often used in CD .ROMs.
.1 audio layer .3 (MP3) compression evolved from early MPEG work. MPEG1 is an
established, medium quality format (similar to VHS) supported by all players and
platforms. Although not the best quality it will work well on older specification
MPEG .2 compression (as used
for DVD movies and digital television set .top boxes) is an excellent format for
distributing video, as it offers high quality and smaller file sizes than DV.
Due to the way it compresses video MPEG .2 .encoded footage is more problematic
to edit than DV footage. Despite this, MPEG2 is becoming more common as a capture
format. MPEG 2 uses variable bit rates allowing frames to be encoded with more
or less data depending on their contents. Most editing software now supports MPEG2
editing. Editing and encoding MPEG2 requires more processing power than DV and
should be done on well specified machines. It is not suitable for internet delivery.
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