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Monday, March 27, 2006
InPhase Breaks Data Density Record


Holographic data storage leader InPhase Technologieshas demonstrate the highest data density of any commercial technology by recording 515 gigabits of data per square inch.

Holographic storage takes advantage of volumetric efficiencies rather than recording on the surface of material, as it happens with current magnetic disk drives . InPhase said that it will deliver the first holographic drive and media later this year. The first generation drive has a capacity of 300 gigabytes on a single disk with a 20 megabyte per second transfer rate. The first product will be followed by a family ranging from 800GB to 1.6 terabyte (TB) capacity.

The drives are expected to be be priced a around $8,000.

Densities in holography are achieved by different factors than magnetic storage. Density depends on the number of pixels/bits in a page of data; the number of pages that are stored in a particular volumetric location; the dynamic range of the recording material; the thickness of the material, and the wavelength of the recording laser.

In this demonstration there were over 1.3 million bits per data page, and 320 data pages spaced 0.067 degrees apart were stored in the same volume of material. A collection of data pages is referred to as a book, and InPhase?s PolyTopic recording architecture enables more holograms to be stored in the same volume of material by overlapping not only pages, but also books. Three tracks of overlapping books were written with a track pitch of 700 microns. The InPhase TapestryTM material was 1.5 millimeters thick, and the laser wavelength was 407 nanometers.

?The latest results from our ongoing tests on holographic data density have surpassed expectations,? said Kevin Curtis, chief technology officer of InPhase. ?We are particularly pleased at the rate of improvement. In April of 2005, we demonstrated 200 Gb/in2 data density and - a year later - the density has increased more than 2.5 times. ?

The write transfer rate is determined by the time required to position the laser at the correct angular address, the speed of the shutter, the laser power, and the exposure time. In this demonstration the average exposure time per page was 2.7 milliseconds, which translates into a user write transfer rate of 23 megabytes per second.

InPhase will be presenting several holographic storage papers at the Optical Data Storage Conference from April 23-26, 2006 in Montreal, Canada. In addition, InPhase will exhibit its products at the National Association of Broadcasters convention in Las Vegas next month, from April 24-27 in the Maxell booth C6932, Central Hall of the Las Vegas Convention Center.


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