5d Data Storage Technology.doc 5l434y

Government Polytechnic amravat Electronics and telecommunicatons

5D DATA STORAGE TECHNOLOGY

Guided by Pachpor sir Presented by Abhijit Mandavgade

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ABSTRACT INTRODUCTION HISTORY OF DATA STORAGE 5-D STORAGE TECHNOLOGY CONCEPT OF 5-D STORAGE TECHNOLOGY DATA OPERATION READ OPERATION WRITE OPERATION PRESENT AND FUTURE SCOPE LIFE TIME OF DATA ADVANTAGES DISADVANTAGES APPLICATION

ABSTRACT In the beginning different storage device are developed Punch card, punched tape, floppy disc etc. Then in 1980’s frst optcal device the CD and the CD-ROM were released .Now a days the magnetc tape and floppy disks are outdated concepts. Storage device like Hard Disk having large size, but it can store data for only3-4 years. Also a new storage known as cloud storage is also available but it is also having certain major disadvantages such as extra charges, accessibility and data security. A group of scientsts from University of Southampton has developed a fve dimensional optcal memory crystal having experimentally proven a possibility of recording data into nonstructural glass with the help of high speed laser, which creates a self assembled nanostructure in fused quartz3.

INTRODUCTION Recently , there have been advances in the field of digital data storage promising outstanding data density and long term data storage. A new technology developed at the University of Southampton can do both. The name “Superman memory crystal” given due to its similarities to the “Memory Crystal ” used in the Superman films. It’s estmated that human are producing approximately equipment of 10 million blue-ray discs worth of data of every single day and all of those ones and zeroes have to be stored somewhere. Now researchers in the UK just have the soluton , a fve-dimensional (5-D) digital data storage device that can store 360 terabytes of data.

HISTORY From the beginning of mankind humans are always trying to fnd a way to store informaton for the future use .Now a days when people hear the word storage literally they think about storage devices such as Hard disk, compact disk, Floppy disk, DVD, Magnetc tape etc. 1. Floppy Disk (256 KB) 2. Magnetc Tape (5 MB to 140 MB) 3. Compact Disc (700 MB) 4. Dvd (4.7 GB) 5. Pendrive (1 GB to 1 TB) 6. Hard Drive (80 GB to 16 TB)

5D STORAGE TECHNOLOGY The idea of Superman Memory crystal was frst coined in 1996[1,4]. The superman memory crystal can store 360 TB of data on a single disk for indefnite amount of tme. The whole structure is made up of glass and this glass can resist a temperature of about 1,000° C (1,800° F) [2,3] and would be perfect for creatng portable data achieves that can truly stand the test of tme.Fused quartz created from practcally pure silica is used as the core components. The memory can store digital informaton across the fve dimensions’ as three dimensions of spaces (x,y,z), Orientaton (fourthdimensions ) and Strength of Retardance(ffth dimensions) .6

DATA OPERATION The data is stored in three layers of nanostructured dots separated by five micrometers.Each dot contains information in the form of the intensity and polarization of the laser beam. Since there are five variables – the three dimensions plus polarization and intensity – it is referred as technique of "5D data storage.". The information encoding is realized in five dimensions: the and orientation in addition to the three dimensions. The orientation of dot or photon whether it has bit value 1 or 0.The dots appears as the visible vortices in the glass under microscope.

READ OPERATION A laser scanning device used in optcal devices used in various optcal storage devices same is used in Superman memory crystal of reading data.Another way of reading data from the memory crystal is by using microscope and a polarizer. The surface of the recorded memory crystal contains large track of data. The surface contains flat reflectve areas and non-reflectve bump. Those areas are detected by using amount of laser light they reflect. A flat reflalavtve area represents binary 0 and nonreflectve bumps represents binary 1. The intensity distributon at the focal plane was modulated via spatal light simulator(SLM),which splits the incident light onto 256 beams. An adapted weighted Gerchberg-Saxton is used to set the split beam energy at several levels at the back focal plane of the objectve.

The hologram generated on the SLM is re-imaged by 4-f optcal system. In additon half wave plate matrix ,imprinted by laser nanostructuring of fused silica controls polarizaton.9

Fig.c: Read and Write Operation

WRITE OPERATION A femtosecond laser is used to write data on the pure silica glass. Data is written or entered into the glass via femtosecond laser moving at a high speed. A femtosecond is millionth of a billionth of a second. While write operation zero is indicated by absence of a dot .A ‘dot’ with different reflective index can be used to denote binary one. The recording process is done by focusing laser to imprint tiny dots called ‘vowels ’in pure silica glass Data is laid o tracks and the tracks are separated by five micrometer. Nanostructure dots are separated10by one millionth of a meter. Data is recorded at two different levels retardance (1 bit) and axis orientation (2 bit).Each dot stores three bits of data.The current writing speed is 12 Kbits/s but this could range up to 8 Mbits/s using ferroelectric liquid crystal.

PRESENT AND FUTURE SCOPE that data recording could be done with a cheaper laser diode and that high-speed recording and readout should be possible. The research, in themeantme, has been looked upon up by the storage giant Samsung, whichnow seems destned to manufacture the media that records every bit of stored data on the planet. The company says that this technology should beready within the next fve to ten years. 1. Successful implementaton of 300KB text fle with a writng speed of 12Kbit/s. 2. Speed can be increased up to 8Mbit/s. 3. In future write speed might increased to several gigabyte per second. 4. Glass is inexpensive and plentful this technology has a very good chance to become widely available in the future.

ADVANTAGES

1. Large storage capacity A disc that developed on the principle of fve dimensional optcal recordingis to said to have a storage capacity of 360 tera byte. 2. Light and Compact A fve dimensional optcal recording device will have dimensionscomparable to a normal DVD, hence making light and compatble. 3. Data security It provides a safe and secure method of data storage. 4. Compatible with existing technology By reducing the thickness of the spacer we can reduce the thickness of therecording devic. 5. Can be manufactured on a large scale The drive or disc can be manufactured on a large scale according to the drive specifcatons.

DISADVANTAGES

1. Slow writing speed Since the data density is high the disc needs a high data transfer ratehence writng to the disc a slow process. 2. Impracticality of using Titanium Sapphire Femtosecond Laser Currently the researches where carried by a large ttanium sapphirefemtosecond laser which is very

costly process. But the developers are planning to develop a cheaper and smaller diode laser which iscompatble with the drive. 3. Re-writability Since the Gold nanorods are altered from its natural shape during writngfrom rods to spheres re writabillty is not possible.

APPLICATION 1. Medical Field Mainly used to store information large data related to magneticresonance imaging scans (MRI) of a patients. 2. Military and Security Arenas Provides a light and compact way of storing huge data correspondingto research and development department of the military where largemagnetic storage devices are use. 3. Entertainment sector. Act as a large storage device to store super high definition or ultrahigh definition videos. 4. Space research Used to store high resolution images taken by space telescopes and itprovides a single point of data storage for the entire data produced byspace satellites.

CONCLUSION Instead of the current three dimension optcal storage technologies, fve dimensions DVD exploits the colour and polarizaton of light as two additonal demensions along with the three spatal dimensions. These multple variables mean that the same volume of space can hold multple bits in multple ways, the reasearchers explain. For instant, a space that responds to three different colors and two different polarizatons can hold six bits.

REFERENCES 1. Nanophotonics Down Under 2009 Devices and Applicatons – www.swinburne.edu.au 2. Nano-partcle Based Mult-Dimensional Data Storage. By Xiangping Li (Thesis)http://hdl.handle.net/1959.3/59331 3. Five dimensional optcal recording – http://u.nu/5fxr 4. Nanotech DVD – http://foresight.org/nanotechnology_dvd-2/ 5. Five dimensional optcal recording (journal) – http://u.nu/9fxr