3d Optical Data Storage Technology
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Transcript of 3d Optical Data Storage Technology
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It is the term given to any form of optical data storage in which information can be recorded and/or read with three dimensional resolution. This innovation has the potential to provide terabyte-level mass storage on DVD-sized disks.
Data recording and readback are achieved by focusing lasers within the medium.
INTRODUCTION
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HISTORY
In the 1970s, Valeri Barachevskii demonstrated that this photochromism could be produced by two-photon excitation.
Finally at the end of the 1980s Peter T. Rentzepis showed that this could lead to three-dimensional data storage
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Various storage devices till date
I Generation : Compact Disc(CD) – 650/700MB Laser wavelength – 780nm Color of laser – RED
II Generation : Digital Versatile Disc(DVD) – 4.7GB Laser Wavelength - 650nm Color of laser - RED
III Generation : Blu ray Disc(BD) - 25/50GB Laser wavelength – 405nm Color of laser - BLUE
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PROCESS OF WRITING DATA
Non resonant multiphoton absorption ط
Sequential multiphoton absorption ط
Microholography ط
Recording during manufacturing ط
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BLU RAY DISC Invented by SHVJI NAKAMURA of NICHA Corporation.It has the main use of High Definition video & Data Storage.The name Blu-ray Disc derives from the blue-violet laser used to read the disc.
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BD TECHNOLOGY
Pits-Spiral grooves that run from center of the disc to its edges.
Bumps-Other sides of these above edges.
Track Pitch-It is the distance between the two tracks(of pits) on the surface.
DATA IS STORED IN THE PITS
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DISC STRUCTURE
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SPECIFICATIONS OF BD Laser and optics
Hard coating technology
Recording SpeedDrive speed
Data rate Theoretical write time for BD (in minutes)
Mb/sec MB/sec Single layer Double layer
1x 36 4.5 90 180
2x 72 9 45 90
4x 144 18 22.5 45
6x 216 27 15 30
8x 288 36 11.25 22.5
12x 432 54 7.5 15
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BD-ROM (read only) : For pre-recorded content
BD-R (Recordable) : For storing HD data on the disc
BD-RW (Rewritable) : For PC data storage
BD-RE (Rewritable) : For HD TV storage
FORMATS
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CD/DVD vs. BDBD
Data is stored on the top of the 1.1mm thick polycarbonate layer
Numerical Aperture is 0.85
Track Pitch 0.32 micron
Storage capacity is 25/50GB.
Image resolution is HIGH
DVD Data is sandwiched between two 0.6mm thick poly carbonate layers.
Numerical Aperture is 0.65
Track Pitch 0.74 micron
Storage capacity is 15/30GB
Image resolution is POOR
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Pictorial & Graphical comparison
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ADVANTAGES Instantly skip to any part of the disc.
Record HDTV without any quality loss.
Multi-tasking.
Automatically search for an empty space.
Higher density enables better data seek times. and many more……
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FUTURE IN BD
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Than Q
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QUERIES ??????