Research into and the development of data storage devices is a race to keep up This article describes developments in holographic 3D memories, in which. Holographic data storage, or 'three-dimensional data storage', could potentially revolutionize the modern methods used to archive data. Compact discs (CDs) were the first data storage device to use light technology followed by DVDs and Blu-Ray discs. In response to the rapidly changing face of computing and demand for physically smaller, greater capacity and high bandwidth storage devices, the holographic.
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Compact discs revolutionized data storage in the early s, allowing multi-megabytes of data to be stored on a disc that has a diameter of a mere 12 centimeters and a thickness of about 1. Inan improved version of the CD, called holographic memory storage device digital versatile disc DVDwas released, which enabled the storage of full-length movies on a single disc.
The use of light to store data is nothing new. Compact discs CDs were holographic memory storage device first data storage device to use this technology in the s, but it was still a long way off from holographic storage.
DVDs and Blu-Ray discs use a more refined version of the same technology used by CDs to read and write data, so really the technology has been inching in this direction. This concept of optical storage, or holographic memory storage device use of light to store data, is the very essence of holographic data storage.
This new concept of holographic memory will go beyond writing data on the surface of a disc, but will quite literally penetrate the surface, greatly magnifying the physical area available to store data.
The write-once, holographic memory storage device many WORM approach to data storage would ensure content security, preventing the information from being overwritten or modified.
Holographic data storage: the next big thing?
Counterpoints to this claim are that the evolution of data reader technology has — in the last couple of decades — changed every ten years. If this trend continues, it therefore follows that being able to store data for 50— years on one format is irrelevant, because you would migrate the data to a new format after only ten years.
However, claimed longevity of storage has, in the past, proven to be a key indicator of shorter-term reliability of storage media. Current optical formats — such as CD — have largely lived up to the original longevity holographic memory storage device where reputable media makes are used holographic memory storage device have proved to be more reliable shorter-term data carriers than the floppy disk and DAT media they displaced.
Diffraction efficiency is proportional to the square of the index modulation times the effective thickness. The dynamic range determines how many holograms may be multiplexed in a single volume data.
Holographic data storage: the next big thing?
Spatial light modulators SLM are pixelated input devices liquid crystal panelsused to imprint the data to be stored on the object beam. Technical aspects[ edit ] Like other media, holographic media is divided into write once where the storage medium undergoes some irreversible changeholographic memory storage device rewritable media where the change is reversible.
Rewritable holographic storage can be achieved via the photorefractive effect in crystals: Mutually coherent light from two sources creates an interference pattern in holographic memory storage device media.
On the plus side, long-term media stability and reliability is a compelling advantage for deep archiving purposes -- discs and tape simply cannot assure reliability out to 50 years.
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The technology should also become more appealing for shorter term holographic memory storage device and archives as companies continue to rely less on tape backups.
For example, holographic storage attached to a virtual tape library VTL system might be an excellent tape replacement. Holographic media capacity is also limited to about Gbytes. While this capacity is expected to grow substantially over time, it's hard to make a case for a Gbyte optical disc against readily available 1Tbyte hard drives or 1.
Furthermore, the long-term reliability and readability of holographic drives is still unproven.
What is Holographic Data Storage?
Holographic recording is also very data sensitive. It wasn't until much later in the technology's lifecycle that "multi-session" and "burn-proof" techniques were added.
Lesser-known drawbacks to holographic storage include light sensitivity and limited shelf life holographic memory storage device unexposed unrecorded holographic media.
On the other hand, blank unrecorded holographic media behaves more like unexposed photographic paper. Prematurely exposing the holographic discs to light can expose and ruin them, and the unexposed media only holographic memory storage device a shelf life of about three years.
Brief History of Holographic Memory Using holograms as memory storage was first proposed by Pieter Heerden in the s.