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About: Block allocation map     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Structure105726345, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: yago:WikicatComputerFileSystemsyago:Abstraction100002137yago:Arrangement105726596yago:ClassificationSystem105727220yago:Cognition100023271yago:FileSystem105732614yago:PsychologicalFeature100023100buildingyago:Structure105726345 New Facet based on Instances of this Class

In computer file systems, a block allocation map is a data structure used to track disk blocks that are considered "in use". Blocks may also be referred to as allocation units or clusters. CP/M used a block allocation map in its directory. Each directory entry could list 8 or 16 blocks (depending on disk format) that were allocated to a file. If a file used more blocks, additional directory entries would be needed. Thus, a single file could have multiple directory entries. A benefit of this method is the possibility to use sparse files by declaring a large file size but only allocating blocks that are actually used. A detriment of this method is the disk may have free space (unallocated blocks) but data cannot be appended to a file because all directory entries are used.