Sector and Cluster

What is the difference between a sector and a cluster.

please give me a definition of a cluster.
 a sketch is recommended
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ran1Commented:  Cluster and scrool to sector
Cluster A group of sectors on a hard disk drive that is addressed as one logical unit by the operating system.

Sector On a PC hard drive, the minimum segment of track length that can be assigned to store information. A sector can  store 512 bytes of data. On Macintosh and UNIX drives, sectors usually are grouped into blocks or logical blocks that function as the smallest data unit permitted. Since these blocks often are defined as a single sector, the terms block and sector are sometimes used interchangeably in this context.


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