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In computer file systems, a cluster (sometimes also called allocation unit or block) is a unit of disk space allocation for files and directories. To reduce the overhead of managing on-disk data structures, the filesystem does not allocate individual disk sectors by default, but contiguous groups of sectors, called clusters. On a disk that uses 512-byte sectors, a 512-byte cluster contains one sector, whereas a 4-kibibyte (KiB) cluster contains eight sectors. The term cluster was changed to allocation unit in DOS 4.0. However the term cluster is still widely used.

Attributes	Values
rdf:type	Thing organisation
rdfs:label	Data cluster (en)
rdfs:comment	In computer file systems, a cluster (sometimes also called allocation unit or block) is a unit of disk space allocation for files and directories. To reduce the overhead of managing on-disk data structures, the filesystem does not allocate individual disk sectors by default, but contiguous groups of sectors, called clusters. On a disk that uses 512-byte sectors, a 512-byte cluster contains one sector, whereas a 4-kibibyte (KiB) cluster contains eight sectors. The term cluster was changed to allocation unit in DOS 4.0. However the term cluster is still widely used. (en)
differentFrom	Clustered file system Computer cluster
sameAs	Data cluster Data cluster
dbp:wikiPageUsesTemplate	dbt:Distinguish dbt:More_citations_needed dbt:Multiple_issues dbt:Short_description dbt:Update
Subject	Computer file systems File system management
Link from a Wikipage to an external page	http://www.ntfs.com/hard-disk-basics.htm%23Sectors%20and%20Clusters
thumbnail	wiki-commons:Special:FilePath/Disk-structure.svg?width=300
foaf:depiction
gold:hypernym	Unit
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Data_cluster?oldid=1073061987&ns=0
Wikipage page ID	2906189 (xsd:integer)
page length (characters) of wiki page	2604 (xsd:nonNegativeInteger)
Wikipage revision ID	1073061987 (xsd:integer)
Link from a Wikipage to another Wikipage	Fragmentation (computing) Byte Computer file systems Disk sector DOS File system management File Allocation Table File system File system fragmentation Interleaving (disk storage) Track (disk drive) Reading (computer)
has abstract	In computer file systems, a cluster (sometimes also called allocation unit or block) is a unit of disk space allocation for files and directories. To reduce the overhead of managing on-disk data structures, the filesystem does not allocate individual disk sectors by default, but contiguous groups of sectors, called clusters. On a disk that uses 512-byte sectors, a 512-byte cluster contains one sector, whereas a 4-kibibyte (KiB) cluster contains eight sectors. A cluster is the smallest logical amount of disk space that can be allocated to hold a file. Storing small files on a filesystem with large clusters will therefore waste disk space; such wasted disk space is called slack space. For cluster sizes which are small versus the average file size, the wasted space per file will be statistically about half of the cluster size; for large cluster sizes, the wasted space will become greater. However, a larger cluster size reduces bookkeeping overhead and fragmentation, which may improve reading and writing speed overall. Typical cluster sizes range from 1 sector (512 B) to 128 sectors (64 KiB). A cluster need not be physically contiguous on the disk; it may span more than one track or, if sector interleaving is used, may even be discontiguous within a track. This should not be confused with fragmentation, as the sectors are still logically contiguous. A "lost cluster" occurs when a file is deleted from the directory listing, but the File Allocation Table (FAT) still shows the clusters allocated to the file. The term cluster was changed to allocation unit in DOS 4.0. However the term cluster is still widely used. (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Data_cluster
is differentFrom of	Clustered file system Computer cluster
is Wikipage redirect of	Lost cluster Cluster (file system) Cluster size Allocation unit
is Link from a Wikipage to another Wikipage of	Format (command) Fragmentation (computing) Fork (file system) Non-negative matrix factorization Amazon Neptune Block allocation map Lost cluster Distribution Media Format Defragmentation Cloud computing Cloud storage Cluster Cluster (file system) Clustering Microsoft Drive Optimizer Motorola Krave File Allocation Table Cluster size Design of the FAT file system ExFAT Ext2 Extended file attributes Allocation unit
is foaf:primaryTopic of	http://en.wikipedia.org/wiki/Data_cluster

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