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{{Short description|Widely used Linux filesystem format}}
[[Linux]] has several [[filesystem]] drivers for the [[File Allocation Table]] (FAT) filesystem format. These are commonly known by the names used in the <code>[[mount (Unix)|mount]]</code> command to invoke particular drivers in the kernel: ''{{Not a typo|msdos}}'', ''{{Not a typo|vfat}}'', and ''{{Not a typo|umsdos}}''.<ref name="StanfieldSmith">{{cite book |title=Linux system administration |series=Craig Hunt Linux library |author-first1=Vicki |author-last1=Stanfield |author-first2=Roderick W. |author-last2=Smith |edition=2nd |publisher=[[John Wiley and Sons]] |year=2002 |isbn=978-0-7821-4138-2 |pages=166}}</ref><ref name="Ward">{{cite book |title=How Linux works: what every superuser should know |series=No Starch Press Series |author-first=Brian |author-last=Ward |publisher=[[No Starch Press]] |year=2004 |isbn=978-1-59327-035-3 |pages=41}}</ref>
== History and support ==
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== Feature comparison ==
{{anchor|Differences, advantages, and disadvantages}}
All of the Linux filesystem drivers support all three FAT types, namely [[FAT12]], [[FAT16]] and [[FAT32]]. Where they differ is in the provision of support for [[long filename]]s, beyond the [[8.3 filename]] structure of the original FAT filesystem format, and in the provision of Unix file semantics that do not exist as standard in the FAT filesystem format such as [[file permissions]].<ref name="StanfieldSmith"
=== {{Not a typo|msdos}} ===
The ''{{Not a typo|msdos}}'' filesystem driver provides no extra Unix file semantics and no long filename support. If a FAT disk filesystem is mounted using this driver, only 8.3 filenames will be visible, no long filenames will be accessible, nor will any long filename data structures of any kind on the disk volume be maintained. The ''{{Not a typo|vfat}}'' filesystem driver provides long filename support using the same disk data structures that [[Microsoft Windows]] uses for [[VFAT]] long filename support on FAT format volumes, but it does not support any extra Unix file semantics. The ''{{Not a typo|umsdos}}'' filesystem driver provides long filename support, and extra Unix file semantics. However, it does so using on-disk data structures that are not recognized by any filesystem drivers for any operating systems other than Linux.<ref name="StanfieldSmith"/><ref name="Ward"
=== {{Not a typo|umsdos}} ===
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Although the filesystem drivers in the kernel make it possible to access files and directories on FAT formatted volumes in the normal manner, it is also possible to do so without kernel driver support, using the utility programs that form the [[mtools]] utility suite. Like the ''{{Not a typo|vfat}}'' FAT filesystem driver, {{Not a typo|mountlo}} provides long filename support using the same disc data structures that Microsoft Windows uses.<ref name="Smith2"/><ref name="Rajagopal">{{cite book |title=Multi-operating system networking: living with Unix, Netware, and NT |series=Auerbach Best Practices Series |author-first=Raj |author-last=Rajagopal |publisher=[[CRC Press]] |year=2000 |pages=[https://archive.org/details/multioperatingsy0000unse/page/25 25–21] |isbn=978-0-8493-9831-5 |url=https://archive.org/details/multioperatingsy0000unse/page/25 }}</ref><ref name="Welsh">{{cite book |title=Running Linux |series=Essential Guide to Linux |author-first=Matt |author-last=Welsh |edition=4th |publisher=[[O'Reilly Media, Inc.]] |year=2003 |isbn=978-0-596-00272-5 |pages=405}}</ref>
Alternately, one of the [[FUSE (Linux)|FUSE]] filesystem drivers may be used—FatFuse, FuseFat or {{Proper name|mountlo}}.<ref>{{cite web |url=
== POSIX overlay filesystem ==
A modern equivalent of UMSDOS is POSIX Overlay Filesystem ({{Not a typo|posixovl}}). It works in FUSE.<ref>{{Cite web|url=
==See also==
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