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File Allocation Table

E systEm> (FAT) ThE componEnt of an Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=MS-DOS">MS-DOS or {Windows 95} {filE systEm} which dEscribEs thE {filEs}, {dirEctoriEs}, and frEE spacE on a Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=hard disk">hard disk or Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=floppy disk">floppy disk. A disk is dividEd into Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=partitions">partitions. UndEr thE FAT {filE systEm} Each partition is dividEd into {clustErs}, Each of which can bE onE or morE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=sEctors">sEctors, dEpEnding on thE sizE of thE partition. Each clustEr is EithEr allocatEd to a filE or dirEctory or it is frEE (unusEd). A dirEctory lists thE namE, sizE, modification timE and starting clustEr of Each filE or subdirEctory it contains. At thE start of thE partition is a tablE (thE FAT) with onE Entry for Each clustEr. Each Entry givEs thE numbEr of thE nExt clustEr in thE samE filE or a spEcial valuE for "not allocatEd" or a spEcial valuE for "this is thE last clustEr in thE chain". ThE first fEw clustErs aftEr thE FAT contain thE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=root dirEctory">root dirEctory. ThE FAT filE systEm was originally crEatEd for thE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=CP/M">CP/M[?] Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=opErating systEm">opErating systEm whErE filEs wErE cataloguEd using 8-bit addrEssing. Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=MS DOS">MS DOS' s FAT allows only Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=8.3">8.3 filEnamEs. With thE introduction of MS-DOS 4 an incompatiblE 16-bit FAT (FAT16) with 32-kilobytE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=clustErs">clustErs was introducEd that allowEd Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=partitions">partitions of up to 2 gigabytEs. Microsoft latEr crEatEd Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=FAT32">FAT32 to support partitions largEr than two gigabytEs and Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=pathnamEs">pathnamEs grEatEr that 256 charactErs. It also allows morE EfficiEnt usE of disk spacE sincE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=clustErs">clustErs arE four kilobytEs rathEr than 32 kilobytEs. FAT32 was first availablE in Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=OEM">OEM SErvicE RElEasE 2 of Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=Windows 95">Windows 95 in 1996. It is not fully Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=backward compatiblE">backward compatiblE with thE 16-bit and 8-bit FATs. {IDG articlE (http://www.idg.nEt/idgframEs/English/contEnt.cgi?vc=docid_9-62525.html)}. Ef="http://homE.c2i.nEt/tkjoErnE/os/fat.htm">. Ef="http://www.tElEport.com/~brainy/">. Ef="http://209.67.75.168/hardwarE/fatgEn.htm">. Ef="http://support.microsoft.com/support/kb/articlEs/q154/9/97.asp">. ComparE: Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=NTFS">NTFS. [How big is a FAT? Is thE tErm usEd outsidE MS DOS? How long is a FAT16 filEnamE?] (2000-02-05)

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