03-07-2012, 03:31 PM
Holographic Memory
Holographic Memory.pptx (Size: 469.36 KB / Downloads: 37)
Introduction
As computer systems continue to become faster, they will need a way to access larger amounts of data in shorter periods of time.
Holographic memory is a three-dimensional data storage system that can stored information at high density inside the crystal or photopolymer.
Hence holographic storage system has the potential to became the next storage generation over conventional storage system.
What is holographic memory?
It is a memory that can store information in form of holographic image.
It is a technique that can store information at high density inside crystals or photopolymers.
As current storage techniques such as DVD reach the upper limit of possible data density (due to the diffraction limited size of the writing beams), holographic storage has the potential to become the next generation of storage media.
Like other media, holographic media is divided into write once (where the storage medium undergoes some irreversible change),and rewritable media (where the change is reversible). Rewritable holographic storage can be achieved via the photorefractive effect in crystals.
What is HVD
Holographic Versatile Disc (HVD) is an optical disc technology still in the research stage which would hold up to 3.9 terabyte (TB) of information.
It employs a technique known as collinear holography, whereby two lasers, one red and one blue-green, are collimated in a single beam.
The blue-green laser reads data encoded as laser interference fringes from a holographic layer near the top of the disc while the red laser is used as the reference beam and to read servo information from a regular CD-style aluminum layer near the bottom.
Holographic memory systems have been around for decades. They offer far more storage capacity than CDs and DVDs -- even "next-generation" DVDs like Blu-ray -- and their transfer rates leave conventional discs in the dust.
Advantages of HVD
Resistance to damage - If some parts of the medium are damaged, all information can still be obtained from other parts.
2. Efficient retrieval - All information can be retrieved from any part of the medium.
These discs have the capacity to hold up to 3.9 terabyte (TB) of information, which is approximately 6,000 times the capacity of a CD-ROM, 830 times the capacity of a DVD, 160 times the capacity of single-layer Blu-ray-Discs, and about 48 times the capacity of standard computer hard drives.
The HVD also has a transfer rate of 1 gigabit/s.
5. While reading a page the entire page of data can be retrieved quickly and at one time .
Holographic Memory.pptx (Size: 469.36 KB / Downloads: 37)
Introduction
As computer systems continue to become faster, they will need a way to access larger amounts of data in shorter periods of time.
Holographic memory is a three-dimensional data storage system that can stored information at high density inside the crystal or photopolymer.
Hence holographic storage system has the potential to became the next storage generation over conventional storage system.
What is holographic memory?
It is a memory that can store information in form of holographic image.
It is a technique that can store information at high density inside crystals or photopolymers.
As current storage techniques such as DVD reach the upper limit of possible data density (due to the diffraction limited size of the writing beams), holographic storage has the potential to become the next generation of storage media.
Like other media, holographic media is divided into write once (where the storage medium undergoes some irreversible change),and rewritable media (where the change is reversible). Rewritable holographic storage can be achieved via the photorefractive effect in crystals.
What is HVD
Holographic Versatile Disc (HVD) is an optical disc technology still in the research stage which would hold up to 3.9 terabyte (TB) of information.
It employs a technique known as collinear holography, whereby two lasers, one red and one blue-green, are collimated in a single beam.
The blue-green laser reads data encoded as laser interference fringes from a holographic layer near the top of the disc while the red laser is used as the reference beam and to read servo information from a regular CD-style aluminum layer near the bottom.
Holographic memory systems have been around for decades. They offer far more storage capacity than CDs and DVDs -- even "next-generation" DVDs like Blu-ray -- and their transfer rates leave conventional discs in the dust.
Advantages of HVD
Resistance to damage - If some parts of the medium are damaged, all information can still be obtained from other parts.
2. Efficient retrieval - All information can be retrieved from any part of the medium.
These discs have the capacity to hold up to 3.9 terabyte (TB) of information, which is approximately 6,000 times the capacity of a CD-ROM, 830 times the capacity of a DVD, 160 times the capacity of single-layer Blu-ray-Discs, and about 48 times the capacity of standard computer hard drives.
The HVD also has a transfer rate of 1 gigabit/s.
5. While reading a page the entire page of data can be retrieved quickly and at one time .