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Encyclopedia > Holographic Versatile Disc
Picture of an HVD by Optware.
Picture of an HVD by Optware.

Holographic Versatile Disc (HVD) is an optical disc technology which would hold up to 3.9 terabytes (TB) of information. It employs a technique known as collinear holography, whereby two lasers, one red and one green, are collimated in a single beam. The 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 aluminium layer near the bottom. Servo information is used to monitor the position of the read head over the disc, similar to the head, track, and sector information on a conventional hard disk drive. On a CD or DVD this servo information is interspersed amongst the data. Image File history File links Gnome_globe_current_event. ... Image File history File links Hvd_disc. ... Image File history File links Hvd_disc. ... This article is about a measurement term for data storage capacity. ... This article is about the photographic technique. ... For other uses, see Laser (disambiguation). ... For other uses, see Red (disambiguation). ... For other uses, see Green (disambiguation). ... Collimated light is light whose rays are parallel. ... For other uses, see Green (disambiguation). ... This article is about the photographic technique. ... For other uses, see Red (disambiguation). ... Small R/C servo mechanism 1. ... Aluminum redirects here. ... Typical hard drives of the mid-1990s. ... CD redirects here. ... DVD (also known as Digital Versatile Disc or Digital Video Disc) is a popular optical disc storage media format. ...


A dichroic mirror layer between the holographic data and the servo data reflects the green laser while letting the red laser pass through. This prevents interference from refraction of the green laser off the servo data pits and is an advance over past holographic storage media, which either experienced too much interference, or lacked the servo data entirely, making them incompatible with current CD and DVD drive technology.[1] These discs have the capacity to hold up to 3.9 terabytes (TB) of information, which is approximately 5,500 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 4 times the capacity of standard computer hard drives as of 2007. The HVD also has a transfer rate of 1 Gbit/s (128 MB/s). Optware was expected to release a 200 GB disc in early June 2006, and Maxell in September 2006 with a capacity of 300 GB and transfer rate of 20 MB/s.[2] Since the announcement, there have been no further news or products on market. Halogen light bulb capsule (center) with an integrated dichroic reflector. ... For other uses, see Green (disambiguation). ... For other uses, see Red (disambiguation). ... For other uses, see Green (disambiguation). ... This article is about a measurement term for data storage capacity. ... The CD-ROM (an abbreviation for Compact Disc Read-Only Memory (ROM)) is a non-volatile optical data storage medium using the same physical format as audio compact discs, readable by a computer with a CD-ROM drive. ... A Blu-ray Disc (also called BD) is a high-density optical disc format for the storage of digital information, including high-definition video. ... 2007 is a common year starting on Monday of the Gregorian calendar. ... A gigabit is a unit of information or computer storage, abbreviated Gbit or sometimes Gb. ... ReBoot character, see Megabyte (ReBoot). ...

Holographic Versatile Disc structure 1. Green writing/reading laser (532 nm) 2. Red positioning/addressing laser (650 nm) 3. Hologram (data) 4. Polycarbon layer 5. Photopolymeric layer (data-containing layer) 6. Distance layers 7. Dichroic layer (reflecting green light) 8. Aluminium reflective layer (reflecting red light) 9. Transparent base P. PIT
Holographic Versatile Disc structure
1. Green writing/reading laser (532 nm)
2. Red positioning/addressing laser (650 nm)
3. Hologram (data)
4. Polycarbon layer
5. Photopolymeric layer (data-containing layer)
6. Distance layers
7. Dichroic layer (reflecting green light)
8. Aluminium reflective layer (reflecting red light)
9. Transparent base
P. PIT

Contents

Wikipedia does not have an article with this exact name. ... Wikipedia does not have an article with this exact name. ...

Technology

Current optical storage saves one bit per pulse, and the HVD alliance hopes to improve this efficiency with capabilities of around 60,000 bits per pulse in an inverted, truncated cone shape that has a 200 micrometer diameter at the bottom and a 500 micrometer diameter at the top. High densities are possible by moving these closer on the tracks: 100 GB at 18 micrometers separation, 200 GB at 13 micrometers, 500 GB at 8 micrometers and a demonstrated maximum of 3.9 TB for 3 micrometer separation on a 12 cm disc. A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the diameter of a droplet of mist or fog. ...


The system uses a green laser, with an output power of 1 watt, a high power for a consumer device laser. So a major challenge of the project for widespread consumer markets is to either improve the sensitivity of the polymer used, or develop and commoditize a laser capable of higher power output and suitable for a consumer unit.[citation needed] For other uses, see Laser (disambiguation). ... For other uses, see Watt (disambiguation). ... A polymer (from Greek: πολυ, polu, many; and μέρος, meros, part) is a substance composed of molecules with large molecular mass composed of repeating structural units, or monomers, connected by covalent chemical bonds. ... Commoditization is a term from both economics and the social sciences which is used to describe the process by which a good becomes saleable in the market. ...


Storage capacity in context

Holographic Versatile Card, a variation of the Holographic Versatile Disc
Holographic Versatile Card, a variation of the Holographic Versatile Disc

It has been estimated that the books in the U.S. Library of Congress, one of the largest libraries in the world, would contain a total of about 20 terabytes if scanned in text format. Not including images from the books, the content could be stored with capacity to spare on six 3.9 TB discs. Image File history File links HVC.svg‎ [edit] Summary Holographic Versatile Card Modelled after a press release photo by Optware. ... Image File history File links HVC.svg‎ [edit] Summary Holographic Versatile Card Modelled after a press release photo by Optware. ... There are very few or no other articles that link to this one. ... Construction of the Thomas Jefferson Building, from July 8, 1888 to May 15, 1894. ...

  • At 15 meter resolution and 32-bit color (about the resolution found in unpopulated areas on Google Earth), a map of the land masses of Earth would occupy just over 2 TB.
  • Using MPEG4 ASP encoding, a 3.9 TB HVD could hold 4,600–11,900 hours of video—just over one year of uninterrupted video at usual encoding rates.[3]
  • Using typical satellite radio encoding (CT-aacPlus at 40 kbit/s), a 3.9 TB HVD could hold over 26.5 years of uninterrupted stereo audio.

Google Earth is a virtual globe program that was originally called Earth Viewer and was created by Keyhole, Inc. ... MPEG-4 Part 2 is a video compression technology developed by MPEG. It belongs to the MPEG-4 ISO/IEC standard (ISO/IEC 14496-2). ... In telecommunications and computing, bitrate (sometimes written bit rate, data rate or as a variable Rbit) is the number of bits that are conveyed or processed per unit of time. ...

Competing technologies

HVD is not the only technology in high-capacity, optical storage media. InPhase Technologies is developing a rival holographic format called Tapestry Media, which they claim will eventually store 1.6 TB with a data transfer rate of 120 MB/s (960 Mbit), and several companies are developing TB-level discs based on 3D optical data storage technology. Such large optical storage capacities compete favorably with both HD DVD and Blu-ray Disc. However, holographic drives are projected to initially cost around US$15,000, and a single disc around US$120–180, although prices are expected to fall steadily.[4] The market for this format is not initially the common consumer, but enterprises with very large storage needs. InPhase Technologies is a technology company developing holographic storage devices and media. ... Info A computer disc about the size of a DVD that can hold 60 times more data will go on sale in 2006, according to its American developer InPhase Technologies, a Lucent spin off. ... Schematic representation of a cross-section through a 3D optical storage disc (yellow) along a data track (orange marks). ... HD-DVD disc HD DVD (for High Density Digital Versatile Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. HD DVD is similar to the competing Blu-ray Disc, which also uses the same CD sized (120 mm diameter) optical data... A Blu-ray Disc (also called BD) is a high-density optical disc format for the storage of digital information, including high-definition video. ...


The HVD FORUM

The HVD FORUM (formerly the HVD Alliance) is a coalition of corporations purposed to provide an industry forum for testing and technical discussion of all aspects of HVD design and manufacturing. By cooperating, members of the Forum hope to expedite development and engender a market receptive to HVD technology.


As of February 2006, the HVD FORUM comprises these corporations: 2006 is a common year starting on Sunday of the Gregorian calendar. ...

Alps Electric Co. ... CMC Magnetics Corporation is one of worlds largest optical disc manufacturers, established in 1978. ... Fujifilm Holdings Corporation or Fujifilm ) is a Japanese company known for its photographic film and cameras. ... Konica Minolta Holdings, Inc. ... LiteOn are a popular manufacturer of DVD and CD writers. ... 1. ...

Standards

On December 9, 2004 at its 88th General Assembly the standards body Ecma International created Technical Committee 44, dedicated to standarizing HVD formats based on Optware's technology. On June 11, 2007, TC44 published the first two HVD standards[5]: ECMA-377[6], defining a 200GB HVD "recordable cartridge" and ECMA-378[7], defining a 100GB HVD-ROM disc. Its next stated goals are 30 GB HVD cards and submission of these standards to the International Organization for Standardization for ISO approval.[8] Ecma International is an international, private (membership-based) standards organization for information and communication systems. ... “ISO” redirects here. ...


References

  1. ^ What's New (2004-08-23). Archived from the original on 2004-10-09.
  2. ^ Maxell focuses on holographic storage. CNET News.com (2005-11-28). Retrieved on 2007-05-28.
  3. ^ Common compression rates for personal storage vary between around 780 and 2000 kbit/s. 3.9 TB equals 2000 kbit/s times 4,650 hours, or 780 kbit/s times 11,930 hours.
  4. ^ Hitachi-Maxell to Ship Holographic Storage this Year. DailyTech (2006-08-03). Retrieved on 2007-05-28.
  5. ^ Ecma releases new Holographic Information Storage Standards. Ecma press release (2007-07-04).
  6. ^ Information Interchange on Holographic Versatile Disc (HVD) Recordable Cartridges – Capacity: 200 Gbytes per Cartridge. ECMA-377.
  7. ^ Information Interchange on Read-Only Memory Holographic Versatile Disc (HVD-ROM) – Capacity: 100 Gbytes per disk. ECMA-378.
  8. ^ Ecma standardizes Holographic Information Storage. Ecma press release (2005-01-26).

Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... is the 282nd day of the year (283rd in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 148th day of the year (149th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 148th day of the year (149th in leap years) in the Gregorian calendar. ...

See also

DVD (also known as Digital Versatile Disc or Digital Video Disc) is a popular optical disc storage media format. ... A Blu-ray Disc (also called BD) is a high-density optical disc format for the storage of digital information, including high-definition video. ... HD-DVD disc HD DVD (for High Density Digital Versatile Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. HD DVD is similar to the competing Blu-ray Disc, which also uses the same CD sized (120 mm diameter) optical data... Ultra Density Optical (UDO) is a next-generation optical disc format designed for high-density storage of high-definition video and data. ... PDD, ProDATA or Professional Disc for DATA is a recordable optical disc format which was introduced by Sony in 2003. ... It has been suggested that Holographic data storage be merged into this article or section. ... Info A computer disc about the size of a DVD that can hold 60 times more data will go on sale in 2006, according to its American developer InPhase Technologies, a Lucent spin off. ... Schematic representation of a cross-section through a 3D optical storage disc (yellow) along a data track (orange marks). ... Protein-Coated Disc (PCD) is a theoretical optical disc technology currently being developed by Professor V. Renugopalakrishnan, formerly of Harvard Medical School and Florida International University. ... Magneto-optical disc. ... There are very few or no other articles that link to this one. ... Look up SVOD in Wiktionary, the free dictionary. ... The Stacked Volumetric Optical Disk (or SVOD) is an optical disk format developed by Hitachi/Maxell, which uses an array of wafer-thin optical disks to allow data storage of around 1TB. Each wafer (a thin polycarbonate disk) holds around 9. ... InPhase Technologies is a technology company developing holographic storage devices and media. ...

External links

  • DaTARIUS signs agreement with InPhase Technologies to be their sole sales, service and support supplier of Tapestry Media hardware and media to ship starting in 2007 (300 GB WORM discs) with 600 GB discs and re-writable technology in 2008 as well as 1.6 TB media available in 2010.
  • HVD Forum standards consortium.
  • Optware, creator of HVD format.
  • InPhase, a company developing a competing holographic storage format (*See Above).
  • Video explaining holographic storage – PC Magazine, October 4, 2006
  • Holography system rides single beam EE Times, 27 February 2006 – interview with Hideyoshi Horimai and Yoshio Aoki of Optware Corp.
  • Holographic storage standards eyed EE Times, 28 February 2006 – article about the upcoming technical committee meeting to begin standardization of HVD.
  • How stuff works explains how HVD works.

  Results from FactBites:
 
Holographic Versatile Disc: Information from Answers.com (1228 words)
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 aluminium layer near the bottom.
These discs have the capacity to hold up to 3.9 terabytes (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 8 times the capacity of standard computer hard drives as of 2006.
Optware is expected to release a 200 GB disc in early June of 2006, and Maxell in September 2006 with a capacity of 300 GB and transfer rate of 20 MB/s [3] [4].
Holographic Versatile (527 words)
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 to read servo information from a regular CD-style aluminum layer near the bottom.
A dichroic mirror layer between the holographic data and the servo data reflects the blue-green laser while letting the red laser pass through.
The HVD Alliance is a coalition of corporations purposed to provide an industry forum for testing and technical discussion of all aspects of HVD design and manufacturing.
  More results at FactBites »

 
 

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