10-07-2010, 03:43 PM
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FLUORESCENT MULTILAYER DISC
Presented By:
B.Santosh
07895A0409
FLUORESCENT MULTILAYER DISC (FMD)
¢ Fluorescent Multi-Layer Discs (FMDs)
are a new technology being developed
by Constellation 3D Inc.
¢ FMD stores digital data in three
dimensions.
¢ It is an optical data storage format
similar in size and appearance to
regular CD-ROMs and DVDs.
¢ FMD is a readable disc.
¢ Max data transfer rates are
approximately 1GB/sec.
¢ FMD is a transparent disc.
¢ It consists of multiple data layers.
¢ Data is recorded on multiple layers
inside a disc.
¢ Capacity of each data layer is 4.7
GB.
¢ Recording, reading & storing of data
is accomplished by fluorescent
material.
¢ Fluorescent material emit radiation
when exited by an external light
source.
¢ FMD can hold up to 20-140GB of
data on 12-30 data layers, with total
thickness under 2mm.
OVERVIEW ON CD-ROM
¢ Single data layer
¢ Data layer - Reflective (Aluminum)
¢ Data bits stored in the form of
physically molded pits.
¢ Smooth area surrounding pits are
called lands.
¢ Red laser is used to read data.
¢ Storage capacity : 650MB.
¢ Data access speed range: 80 to 120ms
¢ Max data transfer rate: 5MB/sec.
OVERVIEW ON DVD-ROM
¢ DVD consists of 2 data layers.
¢ Data layer - Reflective (Aluminum)
¢ Distance between recording tracks: less than
half of CDs.
¢ Pit size is less than half of that of CD-ROMs.
¢ Red laser is used to read data.
¢ Require reduced laser wavelength to read small
size pits.
¢ Storage capacity : 4.7GB
TECHNOLOGICAL OVERVIEW OF FMD
¢ FMD is a transparent disc.
¢ No reflective layer like CD/DVD.
Technology in CD:
Ø Beam of laser hits on data layer
Ø It reflects from aluminum data
layer
Ø Fixed with a detector-receiver
Technology in FMD:
No reflected laser beam.
Principle of operation based on a
phenomenon Photochromism
An organic material called ËœStable
Photochromeâ„¢ is used as fluorescent
material.
Photochrome initially doesn't possess
fluorescent properties.
Photochrome when acted upon by
laser beam starts photo chemical
reactions & obtain the fluorescent
properties.
Simulation of fluorescent material
by laser to produce incoherent
light.
Emission of data stored incoherent
light.
Incoherent light passes through
adjacent data layers without
getting distorted.
Filtration of emitted light before it
reaches the drive's detector.
Filtration of emitted light before it
reaches the drive's detector.
FMD RECORDING
¢ Technology used: WORM (Write Once
Read Many)
¢ A series of rewritable discs called FMD
WORM
¢ Two rules to be followed while recording :
The write laser should able to
turn the fluorescence on or off.
Threshold power of laser for recording
& less power for reading.
Recording principles in FMD
Thermal:
Usage of materials that possesses fluorescent properties
from beginning (logical one).
When recording the segments, which are thermally acted
upon with laser, the fluorescent properties are lost (logical
zero)
Chemical:
Usage of a material that doesn't possess fluorescent
properties form the beginning.
When acting upon with a laser a photochemical reaction
starts, and the material gets fluorescent properties.
a low power laser is enough, or even a usual LED
FMD READ DEVICE
¢ Drives for FMD can easily understand
CD/DVD.
¢ FMD drives are similar to CD/DVD.
¢ The type of reading:
Successive reading
Successive-parallel reading
Parallel reading
Parallel Reading
A sequence of bits is recorded not
along a track but deep into layers.
Reading process is carried out with the help of a photosensitive
element (an array of CCD cameras)
Device can read low-power fluorescence of several tens MHz.
Reading speed reaches 1 gigabit/s
Mechanical speed of the drive is 450 times lower than that of DVD.
CONCLUSION
¢ Man™s need for additional storage space is increasing .
¢ The FMD Digital Cinema disc has the potential to provide a
secure, removable, single disc distribution method.
¢ The FMD can provide us with a staggering 140 GB of
storage space seems to be an enticing solution for the storage
- hungry masses.
FLUORESCENT MULTILAYER DISC
Presented By:
B.Santosh
07895A0409
FLUORESCENT MULTILAYER DISC (FMD)
¢ Fluorescent Multi-Layer Discs (FMDs)
are a new technology being developed
by Constellation 3D Inc.
¢ FMD stores digital data in three
dimensions.
¢ It is an optical data storage format
similar in size and appearance to
regular CD-ROMs and DVDs.
¢ FMD is a readable disc.
¢ Max data transfer rates are
approximately 1GB/sec.
¢ FMD is a transparent disc.
¢ It consists of multiple data layers.
¢ Data is recorded on multiple layers
inside a disc.
¢ Capacity of each data layer is 4.7
GB.
¢ Recording, reading & storing of data
is accomplished by fluorescent
material.
¢ Fluorescent material emit radiation
when exited by an external light
source.
¢ FMD can hold up to 20-140GB of
data on 12-30 data layers, with total
thickness under 2mm.
OVERVIEW ON CD-ROM
¢ Single data layer
¢ Data layer - Reflective (Aluminum)
¢ Data bits stored in the form of
physically molded pits.
¢ Smooth area surrounding pits are
called lands.
¢ Red laser is used to read data.
¢ Storage capacity : 650MB.
¢ Data access speed range: 80 to 120ms
¢ Max data transfer rate: 5MB/sec.
OVERVIEW ON DVD-ROM
¢ DVD consists of 2 data layers.
¢ Data layer - Reflective (Aluminum)
¢ Distance between recording tracks: less than
half of CDs.
¢ Pit size is less than half of that of CD-ROMs.
¢ Red laser is used to read data.
¢ Require reduced laser wavelength to read small
size pits.
¢ Storage capacity : 4.7GB
TECHNOLOGICAL OVERVIEW OF FMD
¢ FMD is a transparent disc.
¢ No reflective layer like CD/DVD.
Technology in CD:
Ø Beam of laser hits on data layer
Ø It reflects from aluminum data
layer
Ø Fixed with a detector-receiver
Technology in FMD:
No reflected laser beam.
Principle of operation based on a
phenomenon Photochromism
An organic material called ËœStable
Photochromeâ„¢ is used as fluorescent
material.
Photochrome initially doesn't possess
fluorescent properties.
Photochrome when acted upon by
laser beam starts photo chemical
reactions & obtain the fluorescent
properties.
Simulation of fluorescent material
by laser to produce incoherent
light.
Emission of data stored incoherent
light.
Incoherent light passes through
adjacent data layers without
getting distorted.
Filtration of emitted light before it
reaches the drive's detector.
Filtration of emitted light before it
reaches the drive's detector.
FMD RECORDING
¢ Technology used: WORM (Write Once
Read Many)
¢ A series of rewritable discs called FMD
WORM
¢ Two rules to be followed while recording :
The write laser should able to
turn the fluorescence on or off.
Threshold power of laser for recording
& less power for reading.
Recording principles in FMD
Thermal:
Usage of materials that possesses fluorescent properties
from beginning (logical one).
When recording the segments, which are thermally acted
upon with laser, the fluorescent properties are lost (logical
zero)
Chemical:
Usage of a material that doesn't possess fluorescent
properties form the beginning.
When acting upon with a laser a photochemical reaction
starts, and the material gets fluorescent properties.
a low power laser is enough, or even a usual LED
FMD READ DEVICE
¢ Drives for FMD can easily understand
CD/DVD.
¢ FMD drives are similar to CD/DVD.
¢ The type of reading:
Successive reading
Successive-parallel reading
Parallel reading
Parallel Reading
A sequence of bits is recorded not
along a track but deep into layers.
Reading process is carried out with the help of a photosensitive
element (an array of CCD cameras)
Device can read low-power fluorescence of several tens MHz.
Reading speed reaches 1 gigabit/s
Mechanical speed of the drive is 450 times lower than that of DVD.
CONCLUSION
¢ Man™s need for additional storage space is increasing .
¢ The FMD Digital Cinema disc has the potential to provide a
secure, removable, single disc distribution method.
¢ The FMD can provide us with a staggering 140 GB of
storage space seems to be an enticing solution for the storage
- hungry masses.
