Holographic Memory
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Holographic Versatile Disc (HVD) is an optical disc technology that can store up to several terabytes of data using holographic three-dimensional data storage. HVD uses a collinear holography technique to record pages of data holographically inside a photopolymer recording layer, allowing much higher density data storage than existing optical disc technologies like DVD and Blu-ray. HVD discs have a potential storage capacity of 3.9 terabytes on a disc 10-12 cm in diameter, compared to 25 gigabytes for Blu-ray, as well as faster data transfer rates and a significantly longer archival life expectancy than magnetic or conventional optical storage.
Holographic Memory
- 1. By Sayandeb Banerjee (13000311075) Shiladitya Bandopadhyay (13000311077) Siddhartha Chattaraj (13000311082) Soumya Deep Das (13000311089) Mentor Prof. Amiya Kumar Sarkar
- 2. • A Glance at History • What is a Hologram? • What is Holographic Memory? • Working Principle • HVD • HVD Disc Structure • Collinear Holography – Writing Data • Collinear Holography – Reading Data • HVD vs. Other Optical Discs
- 3. The Drive for More Memory! 1928 Magnetic Tape 1956 Hard Disk 1971 Floppy Drive 1980 CD 1994 Flash 1995 DVD 2003 Bluray HVD
- 4. LASER OBJECT BEAM SPLITTER DIFFUSION LENSES “A three-dimensional image formed by the interference of light beams from a laser or other coherent light source.”
- 5. • A mass storage technology that uses three- dimensional holographic images to enable more information to be stored in a much smaller space. • A potential technology in the area of high- capacity data storage currently dominated by magnetic and conventional optical data storage.”
- 6. 1010011001110001011010 1010101010101010100101 0101010010101010001100 1101011111101101111101 0101010010010101101010 SLM COVER LAYER RECORDING LAYER REFLECTIVE LAYER OBJECTIVE LENS
- 7. An optical disc technology developed between April 2004 and mid-2008 that can store up to several terabytes of data on an optical disc 10 cm or 12 cm in diameter.
- 8. Gap Layer Pit Base Layer Aluminium reflective Layer Dichroic Mirror Layer Recording Layer (photo polymer) Cover Layer Hologram Red Light Green or Blue Light
- 11. DVD DVD Blu-ray Blu-ray HVD Number of Layers Single Dual Single Dual 200 +/- Recording Capacity 4.7BG 9.4GB 25GB 50GB 3.9TB Data Transfer Rate 11.08MB/s 11.08MB/s 36MB/s 36MB/s 1GB/s IBM's test platforms can store up to 390 bits per square micron. DVDs, by contrast, have a storage density of about five bits per square micron. Storage & Speed
- 12. Technology Data is burnt 1 bit at a time Thin surface recording substrate~1mm Serial data 1bit/pulse Volumetric recording Page data is recorded in the volumetric Recording layer Page data through SLM 60,000 bits/pulse 200 – 300bits/ mm Conventional Optical Disc Holographic Optical Disc
- 13. Life Expectancy HVD’s have an estimated archival life expectancy of at least 50 years or more compared to CD/DVD archival life of 2 to 5 years (even though published life expectancies are often cited as 10 to 25 years or longer for optical media, it depends on the storage conditions and quality of the disks).