Free space optical communications is a line-of-sight (LOS) technology that transmits a modulated beam of visible or infrared light through the atmosphere for broadband communications. In a manner similar to fiber optical communications, free space optics uses a light emitting diode (LED) or laser (light amplification by stimulated emission of radiation) point source for data transmission. However, in free space optics, an energy beam is collimated and transmitted through space rather than being guided through an optical cable. These beams of li ....etc

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The Department of Civil Engineering has been in existence since the inception of IIT Madras in 1959 and has grown into a full fledged department with specialisations in all the major areas of Civil Engineering. The departmental activities embrace Planning, Design, Construction and Management. The academic programmes, B. Tech., M.Tech., M.S. and Ph.D., of the Civil Engineering department at IIT Madras are some of the best in the country and the world. Many of the faculty members have received advanced degrees and/or training from reputed institu ....etc

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what are micro hard disk drives ?
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Optical storage is the storage of data on an optically readable medium. Data is recorded by making marks in a pattern that can be read back with the aid of light, usually a beam of laser light precisely focused on a spinning optical disc. An older example of optical storage that does not require the use of computers, is microform. There are other means of optically storing data and new methods are in development. An optical disc drive is a device in a computer that can read CD-ROMs or other optical discs, such as DVDs and Blu-ray discs. Optical ....etc

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Optical data storage is an alternative to magnetic disk data storage. Currently data access times are extremely slow for magnetic disks when compared to the speed of execution of CPUs so that any improvement in data access speeds will greatly increase the capabilities of computers, especially with large data and multimedia files. Optical memory is a technology that uses a three dimensional medium to store data and it can access such data a page at a time instead of sequentially, which leads to increases in storage density and access speed.

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Dynamic Data Reallocation in Hybrid Disk Arrays
A Seminar Report
by
Simy Antony
M105116
Department of Computer Science & Engineering
College of Engineering Trivandrum
Kerala - 695016
2010-11



Abstract
Current disk arrays consist purely of hard disk drives, which normally provide huge storage
capacities with low cost and high throughput for data-intensive applications. Nevertheless, they
have some inherent disadvantages such as long access latencies and ener ....etc

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Optical data storage is an alternative to magnetic disk data storage. At present, data access times are extremely slow for magnetic disks when compared to the execution speed of CPUs, so that any improvement in data access speeds will greatly increase the capabilities of computers, Especially with large data and multimedia files. Optical memory is a technology that uses a three-dimensional means to store data and can access such data one page at a time instead of sequentially, which leads to increases in storage density and access speed. Optica ....etc

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