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deduplication

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deduplication
A method for compressing data by storing only changes to the original data. For example, when a document is created, it is stored as a regular, complete file. When changes are made, deduplication stores only the data that has been modified in a subsequent file with indexes to the original. The changes may be identified by bytes or blocks.

In file deduplication, only one copy of the file is stored even though it may be referenced from many sources. For example, if the same attachment is used in several e-mail messages, the second and subsequent messages are changed to link to the original attachment rather than duplicating it each time.


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Summary: EMC Corporation (NYSE:EMC) today announced the industry's first cascaded EMC Corporation (NYSE:EMC) today announced the industry's first cascaded replication capability for its Data Domain inline deduplication storage, one of several enhancements to the company's Data Domain Replicator software option.
Worldwide Computer Products News-23 September 2009-EMC enhances Data Domain inline deduplication with cascaded replication capability(C)1995-2009 M2 COMMUNICATIONS http://www.
com (Staff) NetApp said "uncle" after EMC outbid it for a second time in its quest to acquire Data Domain Inc, but some industry observers believe EMC, in its zeal to acquire the deduplication vendor, may have overpaid for the prize and could have a difficult time realizing a return on its investment.
 
 
 
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