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- Extent_(file_systems) abstract "An extent is a contiguous area of storage reserved for a file in a file system, represented as a range. A file can consist of zero or more extents; one file fragment requires one extent. The direct benefit is in storing each range compactly as two numbers, instead of canonically storing every block number in the range.Extent-based file systems can also eliminate most of the metadata overhead of large files that would traditionally be taken up by the block allocation tree. Because the savings are small compared to the amount of stored data (for all file sizes in general) but make up a large portion of the metadata (for large files), the benefits in storage efficiency and performance are slight, whereas the reduction in metadata is significant and reduces exposure to file system corruption as one bad sector in the block allocation tree causes much greater data loss than one bad sector in stored data.In order to resist fragmentation, several extent based file systems do allocate-on-flush. Many modern fault tolerant file systems also do copy-on-write, although that increases fragmentation. As a similar design, the CP/M file system uses extents as well, but those do not correspond to the definition given above. CP/M's extents appear contiguously as a single block in the combined directory/allocation table, and they do not necessarily correspond to a contiguous data area on disk.".
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- Extent_(file_systems) wikiPageWikiLink AIX_(operating_system).
- Extent_(file_systems) wikiPageWikiLink Allocate-on-flush.
- Extent_(file_systems) wikiPageWikiLink Apple_Inc..
- Extent_(file_systems) wikiPageWikiLink Automatic_Storage_Management.
- Extent_(file_systems) wikiPageWikiLink Bad_sector.
- Extent_(file_systems) wikiPageWikiLink BeOS.
- Extent_(file_systems) wikiPageWikiLink Be_File_System.
- Extent_(file_systems) wikiPageWikiLink Btrfs.
- Extent_(file_systems) wikiPageWikiLink M.
- Extent_(file_systems) wikiPageWikiLink M_file_system.
- Extent_(file_systems) wikiPageWikiLink Category:Computer_file_systems.
- Extent_(file_systems) wikiPageWikiLink Clustered_file_system.
- Extent_(file_systems) wikiPageWikiLink Comparison_of_file_systems.
- Extent_(file_systems) wikiPageWikiLink Copy-on-write.
- Extent_(file_systems) wikiPageWikiLink Digital_Equipment_Corporation.
- Extent_(file_systems) wikiPageWikiLink EComStation.
- Extent_(file_systems) wikiPageWikiLink Ext4.
- Extent_(file_systems) wikiPageWikiLink Fault_tolerance.
- Extent_(file_systems) wikiPageWikiLink Fault_tolerant.
- Extent_(file_systems) wikiPageWikiLink File_system.
- Extent_(file_systems) wikiPageWikiLink File_system_fragmentation.
- Extent_(file_systems) wikiPageWikiLink Files-11.
- Extent_(file_systems) wikiPageWikiLink GNU_General_Public_License.
- Extent_(file_systems) wikiPageWikiLink GPL.
- Extent_(file_systems) wikiPageWikiLink HFS_Plus.
- Extent_(file_systems) wikiPageWikiLink HP_Multi-Programming_Executive.
- Extent_(file_systems) wikiPageWikiLink Haiku_(operating_system).
- Extent_(file_systems) wikiPageWikiLink Hewlett-Packard.
- Extent_(file_systems) wikiPageWikiLink Hierarchical_File_System.
- Extent_(file_systems) wikiPageWikiLink High_Performance_File_System.
- Extent_(file_systems) wikiPageWikiLink IBM_AIX.
- Extent_(file_systems) wikiPageWikiLink IBM_Journaled_File_System_2_(JFS2).
- Extent_(file_systems) wikiPageWikiLink IceFileSystem.
- Extent_(file_systems) wikiPageWikiLink JFS_(file_system).
- Extent_(file_systems) wikiPageWikiLink Linux.
- Extent_(file_systems) wikiPageWikiLink Linux_kernel.
- Extent_(file_systems) wikiPageWikiLink Macintosh.
- Extent_(file_systems) wikiPageWikiLink Magnussoft_ZETA.
- Extent_(file_systems) wikiPageWikiLink Microsoft.
- Extent_(file_systems) wikiPageWikiLink Microsoft_SQL_Server.
- Extent_(file_systems) wikiPageWikiLink Microsofts.
- Extent_(file_systems) wikiPageWikiLink MorphOS.
- Extent_(file_systems) wikiPageWikiLink Multi-Programming_Executive.
- Extent_(file_systems) wikiPageWikiLink NTFS.
- Extent_(file_systems) wikiPageWikiLink Norsk_Data.
- Extent_(file_systems) wikiPageWikiLink OCFS2.
- Extent_(file_systems) wikiPageWikiLink 2.
- Extent_(file_systems) wikiPageWikiLink OpenVMS.
- Extent_(file_systems) wikiPageWikiLink Oracle_Corporation.
- Extent_(file_systems) wikiPageWikiLink Reiser4.
- Extent_(file_systems) wikiPageWikiLink SINTRAN_III.
- Extent_(file_systems) wikiPageWikiLink Shared_disk_file_system.
- Extent_(file_systems) wikiPageWikiLink Silicon_Graphics.
- Extent_(file_systems) wikiPageWikiLink Sintran_III.
- Extent_(file_systems) wikiPageWikiLink Universal_Disk_Format.
- Extent_(file_systems) wikiPageWikiLink VERITAS_File_System.
- Extent_(file_systems) wikiPageWikiLink Veritas_File_System.
- Extent_(file_systems) wikiPageWikiLink XFS.
- Extent_(file_systems) wikiPageWikiLinkText "Extent (file systems)".
- Extent_(file_systems) wikiPageWikiLinkText "Extent".
- Extent_(file_systems) wikiPageWikiLinkText "Extents".
- Extent_(file_systems) wikiPageWikiLinkText "extent (file systems)".
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- Extent_(file_systems) subject Category:Computer_file_systems.
- Extent_(file_systems) hypernym Area.
- Extent_(file_systems) type Place.
- Extent_(file_systems) comment "An extent is a contiguous area of storage reserved for a file in a file system, represented as a range. A file can consist of zero or more extents; one file fragment requires one extent. The direct benefit is in storing each range compactly as two numbers, instead of canonically storing every block number in the range.Extent-based file systems can also eliminate most of the metadata overhead of large files that would traditionally be taken up by the block allocation tree.".
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