Holographic disk hits 300GB mark

Holographic storage developer InPase Technology Inc. has announced that it has stored data on an optical platter at 515Gbits per square inch, higher than any other optical format to date.

The company also said it is on track to announce later this year its first holographic DVD disk, which will hold 300GB.

The next highest optical disk format, from Plasmon Plc., is called an Ultra Density Optical (UDO) disk and can store 30GB of data. Plasmon does plan 60GB and 120GB versions of its UDO disks over the next few years.

InPhase achieves its high density through holographic recording technology, which overlaps data throughout the recording material on the disk, not just on the surface.

A "data page" of approximately 1 million bits is recorded in one exposure of the laser to the disk. Each data page is located at a unique address within the disk material and several hundred pages of data, each with their own unique address, are recorded in the same location of the medium.

A collection of data pages is referred to as a book. Holographic recording enables more holograms to be stored in the same volume of material by overlapping not only pages, but also books of data. This dramatically increases the storage density.

Holographic recording also improves the data transfer rate which is now 27MB/sec. It was 20MB/sec., according to InPhase CTO Kevin Curtis.

This story, "Holographic disk hits 300GB mark" was originally published by Techworld.com.

Copyright © 2006 IDG Communications, Inc.

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