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Calimetrics
Calimetrics was founded in 1994 by Terrence Wong, Michael O'Neill, and Thomas Burke. Based on Dr. Wong and Dr. O'Neill's UC Berkeley research, the company received startup funding of $1.8M from an Advanced Technology Program (ATP) grant to conduct research and development on pit depth modulated optical data storage systems.(【引用サイトリンク】url=http://www.atp.nist.gov/eao/sp950-2/chapt4-4.htm ) Over the years, Calimetrics raised approximately $50M from government, venture, angel, and corporate sources. Calimetrics was acquired in 2003 by LSI Logic and ceased operations in 2004.
==Technology==
Pit depth modulation, which the company later branded MultiLevel Recording (ML), is one of many techniques to increase recording densities on conventional CD-optical media. Calimetrics' implementation of pit depth modulation, using modified CD drive electronics but no changes to the pickup-head, increased the quantity of distinguishable recording-marks from 2-levels (used by EFM in CD) to 8 levels. The increase in bit-density had a side benefit of increasing data-transfer rate (at the same rotational-velocity of the disc.) MultiLevel, like most of the other strategies proposed for extending CD capacity, was not backward compatible with CD-ROM technology: 2GB ML R, RW, and ROM disc playing and recording required ML-capable writers and special ML-CD compatible media. However, the cost to build CD rewriters with both ML and CD support was less than that of DVD-recordable technology.
Calimetrics's commercialization partners included Iomega, Texas Instruments, TDK, Mitsubishi Chemical, Matsushita Kotobuki Electronics (Panasonic), Sanyo Electric, and Shinano Kenshi (Plextor).
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