22-05-2012, 10:50 AM
THREE DIMENSIONAL DATA STORAGE
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INTRODUCTION
How do you increase data storage capacity? This is a question for all large companies, associated with developing and manufacturing Data storage devices and technologies. Data storage is the primary area of research because of unprecedented hike in data worldwide. Companies such as IBM, Hitachi, Seagate, are actively engaged in innovating and implementing new ways to store maximum data in minimum space.
In the process of finding new technologies, different innovations have been discovered to solve the problem of increased data storage capacity. In may this year, the tech giant proved that 1 terabyte-1trillion bytes of data –to a linear digital tape cartridge also can be managed. That figure, according to company is nearly 10 times the storage of any other tape cartridge currently available.
Tape storage is less susceptible to hacking and data theft problem. The latest technology puts high data storage in a form that makes it easily portable. It is expected, to reduce overall costs for storage.
Holographic storage is a breakthrough technology that stores information within its volume. Current generation storage media store digital information on layers of platters either magnetically or optically. Holographic storage utilizes the space within special types of crystals with optical characteristics, which are very similar those used to create 3D holograms. Holographic storage incorporates the use of laser, optics, images sensors and special crystals that respond to laser light.
The concept of multi-layer reflective optical discs has been proposed by Philips and IBM, and has been demonstrated up to several layers.
THREE DIMENSIONAL DATA STORAGE
It has long been recognized within the data storage scientific community that two –dimensional carriers are insufficient for future generations of memory devices. Research efforts have therefore focused on ways to develop three-dimensional storage including holographic technology and multi-layer storage technology.
Now we know that the currently available data storage technology such as CD/DVD and floppy are not capable of storing large amount of the data. They all are called the one dimensional devices or two-dimensional devices.
Floppy and CD are called one dimensional storage devices because there is only one head which can read/write only on the one surface of the storage medium .While the DVD is called the two dimensional device. Because it head can read/write in the storage on the two layer of its. In the 3-D storage devices, the storage of the data can be done on the more than two layers of the single storage media.
Now, at this moment the Question that arise in your mind that why we can’t tell the hard disc the three dimensional data storage ? And Your argument is that hard disc can also store data on the different surfaces simultaneously. But your thinking is wrong. Because the storage material used in hard disc and 3-D storage devices are different. In case of hard disc there are several cylindrical surfaces of the magnetic fields which are physically separated from each other and also available separated head for each surface for read/write.
HOLOGRAPHIC TECHNIQUES
3.1 INTRODUCTION OF THE TECHNIQUE
Consider the maximum data storage limits we have reached today 15.9G.B on a double-layer, doubled sided DVD.180 GB on hard disk. Think about a system that can store about a terabyte of information (that’s over 15,000 CDs!) on the crystal the size of a sugar cube! Holographic storage is a breakthrough technology that literally goes beneath the surface of media and store information within its volume. Current generation storage media store digital information on layers of platters either magnetically or optically. Holographic storage utilizes the space within special types of crystals with optical characteristics, which are very similar those used to create 3D holograms. Holographic storage incorporates the use of laser, optics, images sensors and special crystals that respond to laser light.
The main advantage of this technology is the speed of retrieving the data such systems will able to retrieve data in tens of microseconds as compared to a data access time of almost 10 milliseconds offered by the fastest hard disk today. Scientists say holographic system could transfer an entire DVD movie in under 30 seconds! Another very important advantage is that of information search and retrieval. Consider the case of large databases that are stored on hard discs today. To retrieve a piece of information, you first provide some reference data the data is then search by its address, track, sector and so on ,after which it is compared with the reference data. In holographic storage.
CONCLUSION
The future ‘FE’ holographic optical drive will offer symmetrical infinite double sided disc or tape to read and writes for the retention of data storage for ten-years or more with drive densities of 200terabits/sq.in.and up. This will allow the holographic optical nanotechnology drive to hold more data than any other type of drive and delivered data much faster. The patents on a semiconductor read/write head for ferromagnetic optical storage raise data storage densities by a factor of 100 or more and will add at least 1000 times the data storage capacity per peripheral storage footprint and data transfer rates over 100 G bits/sec.