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File Allocation Table information


FAT
Developer(s)Microsoft, NCR, SCP, IBM, Compaq, Digital Research, Novell, Caldera
Full nameFile Allocation Table
Variants8-bit FAT, FAT12, FAT16, FAT16B, FAT32, ExFAT, FATX, FAT+
Introduced1977 (1977) with Standalone Disk BASIC-80
Partition IDsMBR/EBR:
  • FAT12: 0x01 e.a. (Extended Attribute)
  • FAT16: 0x040x060x0E e.a.
  • FAT32: 0x0B0x0C e.a.
  • BDP: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
Structures
Directory contentsTable
File allocationLinked list
Bad blocksCluster tagging
Limits
Max volume size
  • FAT12: 32 MB (256 MB for 64 KB clusters)
  • FAT16: 2 GB (4 GB for 64 KB clusters)
  • FAT32: 2 TB (16 TB for 4 KB sectors)
Max file size4,294,967,295 bytes (4 GB − 1) with FAT16B and FAT32[1]
Max no. of files
  • FAT12: 4,068 for 8 KB clusters
  • FAT16: 65,460 for 32 KB clusters
  • FAT32: 268,173,300 for 32 KB clusters
Max filename length8.3 filename, or 255 UCS-2 characters when using LFN[nb 1]
Features
Dates recorded
  • Modified date/time, creation date/time (DOS 7.0 and higher only),
  • access date (only available with ACCDATE enabled),[2]
  • deletion date/time (only with DELWATCH 2)
Date range1980-01-01 to 2099-12-31 (2107-12-31)
Date resolution
  • 2 seconds for last modified time,
  • 10 ms for creation time,
  • 1 day for access date,
  • 2 seconds for deletion time
ForksNot natively
AttributesRead-only, hidden, system, volume, directory, archive
File system
permissions
  • FAT12/FAT16: File, directory and volume access rights for read, write, execute, delete only with DR-DOS, PalmDOS, Novell DOS, OpenDOS, FlexOS, 4680 OS, 4690 OS, Concurrent DOS, Multiuser DOS, System Manager, REAL/32:
    • execute with only FlexOS, 4680 OS, 4690 OS;
    • individual file / directory passwords not with FlexOS, 4680 OS, 4690 OS;
    • world/group/owner permission classes only with multiuser security loaded
  • FAT32: Partial, only with DR-DOS, REAL/32 and 4690 OS
Transparent
compression
  • FAT12/FAT16: Per-volume, SuperStor, Stacker, DoubleSpace, DriveSpace
  • FAT32: No
Transparent
encryption
  • FAT12/FAT16: Per-volume only with DR-DOS
  • FAT32: No

File Allocation Table (FAT) is a file system developed for personal computers and was the default filesystem for MS-DOS and Windows 9x operating systems.[3] Originally developed in 1977 for use on floppy disks, it was adapted for use on hard disks and other devices. The increase in disk drives capacity required three major variants: FAT12, FAT16 and FAT32. FAT was replaced with NTFS as the default file system on Microsoft operating systems starting with Windows XP.[4] Nevertheless, FAT continues to be used on flash and other solid-state memory cards and modules (including USB flash drives), many portable and embedded devices because of its compatibility and ease of implementation.[5]

  1. ^ Cite error: The named reference GB4 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Microsoft_2006_ACCDATE was invoked but never defined (see the help page).
  3. ^ Bhat, W. A. (2010). "Review of FAT data structure of FAT32 file system". Oriental Journal of Computer Science and Technology. 3 (1): 161–164. S2CID 58178285.
  4. ^ "Comparing NTFS and FAT file systems". Microsoft. Archived from the original on 2016-06-20. Retrieved 2014-01-27.
  5. ^ "A brief introduction to FAT (File Allocation Table) formats". www.wizcode.com. Archived from the original on September 25, 2015. Retrieved September 24, 2015.


Cite error: There are <ref group=nb> tags on this page, but the references will not show without a {{reflist|group=nb}} template (see the help page).

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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...

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In computing, the NetWare File System (NWFS) was a file system based on a heavily optimized, journal-based FAT file system. It was used in the Novell...

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as .jpg, .tif, .htm, or .xht. The standard has been common with File Allocation Table (FAT) filesystems since its first implementation in Windows NT 3...

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FIL file

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dBASE Application Generator, a Files List Object file. In Mirror (computing), a file containing a saved File Allocation Table (FAT), created by some DOS mirror...

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Cluster

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that work together Data cluster, a group of disk sectors used in a File Allocation Table Cluster bomb, a type of air-dropped or ground-launched shells Instrument...

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equivalent of the MS/PC DOS File Allocation Table (FAT), the NTFS Master File Table (MFT), and an inode table in a file system for a Unix-like system...

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with support for extents. ext3cow – A versioning file system form of ext3. FAT – File Allocation Table, initially used on DOS and Microsoft Windows and...

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a special block of the file including additional information.[citation needed] The original File Allocation Table (FAT) file system, used by Standalone...

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limitations of the old File Allocation Table filenames, the names 'Program Files', 'Program Files (x86)' and 'Common Program Files' are shortened by the...

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format has a 2 GB maximum file size, which cannot be bypassed. The Xbox hard disk is formatted in FATX (File Allocation Table for Xbox) which has a 4 GB...

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Microsoft Windows version history

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occupied by the file will, however, be erased from the File Allocation Table, marking those sectors available for use by other files created or modified...

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