2b. Unit-6 Optical Memory.ppt

2b. Unit-6 Optical Memory.ppt - Optical Memory A computer...

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Optical Memory
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A computer memory that uses optical techniques which generally involve an addressable laser beam a storage medium which responds to the beam for writing and sometimes for erasing a detector which reacts to the altered character of the medium when it uses the beam to read out stored data.
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ADVANTAGE: The optical disk together with the information stored on it can be mass replicated inexpensive -unlike a magnetic disk. The optical disk is removable. DISADVANTAGE: It is read only and cannot be updated. It has an access time much longer than that of magnetic disk drive.
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Optical Storage CD-ROM Originally for audio 650Mbytes giving over 70 minutes audio Polycarbonate coated with highly reflective coat, usually aluminium Data stored as pits Read by reflecting laser Constant packing density Constant linear velocity
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CD Operation
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1.Disk is formed from a RESIN ,such as “POLYCARBONAT 2.Digitally recorded information is imprinted as a series
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