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What is Cluster?
http://www.softwaretipsandtricks.com/guides/articles/433/1/What-is-Cluster/Page1.html
By Super Admin
Published on 07/2/2011
 
What is Cluster?

What is Cluster?
A cluster refers to the group of sectors that are manipulated as a unit. Depending on the filesystem and the size of the partition, the number of sectors that form a cluster changes. From the operating system’s point of view, the cluster is the smallest storage unit.