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To: Hal Campbell who wrote (12943)	12/7/1999 4:47:00 PM
From: Dave Heibeck	Respond to of 17679

The Video segment continues to heat up... businesswire.com Dave

To: Hal Campbell who wrote (12943)	12/8/1999 12:57:00 AM
From: Glenn Perry	Read Replies (1) \| Respond to of 17679

From the C3D White Paper given at the technology demonstration in Silicon Valley on 30 November 1999: density stated in 'Square inches' <<<While the limits of magnetic recording are still being debated - recently 35 Gbit/sqi has been demonstrated - the limits of conventional optical storage are well understood. Current optical storage technology is working close to the diffraction limit (5 Gbit/sqi ).<<< >>>The areal density of magnetic recording has grown approximately 60% per year during the last decade. Devices with 10 Gbit/sqi are currently in production, 30Gbit/sqi have been demonstrated<<< density stated in square (units unknown) >>>In optical disk drives... The achievable storage density is determined by the size of the recording spot, which in turn is determined by the wavelength of the laser light, resulting (with current 650um red lasers) in a maximum areal density of 5 bits/um2. Advances in laser technology leading to utilization of 480um blue lasers will increase this density fourfold.<<< -What is an um2? Square micrometer? Their stuff: >>>ClearCard? -ROM with up to 20 layers, 400 MB/cm2 data density and up to 10GB capacity* - i.e. twice current single-sided DVD capacity, but at a fraction of the cost and size. <<< Now we're at Megabytes per square centimeters. Looks to me (check my math) that works out to 2.6 GB/sq inch. But if there are 8 bits to a byte, then that would be 20 Gigabit/sq inch density. But what are they achieving now? "10 layer ClearCardTM was demonstrated at the Demonstration of October 4th in Israel. Since then we have achieved 2 gbit/sqi areal density." How big are those cards? "...For instance with the level of existing technology ClearCardTM of 16 cm2 of area...)= 2.48 sq inches. 400 MB/cm2 * 16 cm2 = 6.4 GB on 2 1/2 square inches? And they'll be so cheap, you can just chuck them away! "The design of the reader will be simple, with virtually no moving parts, making them resilient to all kinds of shocks. They will also be user friendly and inexpensive to produce, making them almost disposable."