FAT - Revision history

Joachim Metz: /* ExFAT */

2012-08-10T05:42:46Z

‎ExFAT

2012-08-10T05:42:27Z

‎External links

2012-07-31T08:20:05Z

2012-07-24T17:36:18Z

‎exFAT (sometimes incorrectly called FAT64)

2012-04-09T17:02:07Z

‎Specification

2012-04-09T16:31:52Z

‎FAT16: Nr of clusters was ambiguous -- clarified max to be as per fatgen103.doc, p. 15

2012-04-09T16:29:31Z

‎FAT12: Adjusted max nr of clusters to correspond with statement in fatgen103 document, p. 15.

2012-04-09T16:10:16Z

Added section 'Specification', moved the 'See also' info there, and extended information with known de jure standards.

2010-03-19T02:31:17Z

‎exFAT (sometimes incorrectly called FAT64)

2010-03-19T02:29:13Z

‎exFAT (sometimes incorrectly called FAT64)

@@ Line 225: / Line 225: @@
 == Tools ==
-=== ExFAT ===
+=== exFAT ===
 * [http://code.google.com/p/exfat/ Open Source exFAT file system implementation]
 [[Category:File Systems]]

@@ Line 223: / Line 223: @@
 * http://www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx
 * http://support.microsoft.com/kb/q140418
 [[Category:File Systems]]

@@ Line 72: / Line 72: @@
 Note: FAT32 uses only 28 of 32 possible bits, the upper 4 bits should be left alone. Typically these bits are zero, and are represented above by a question mark (?).
 ==Versions==
@@ Line 225: / Line 223: @@
 * http://www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx
 * http://support.microsoft.com/kb/q140418

← Older revision		Revision as of 17:36, 24 July 2012
Line 122:		Line 122:

	Although Microsoft has published some information on exFAT, there are more technical specifications available from third parties. For example, here is a [http://paradigmsolutions.files.wordpress.com/2009/12/exfat-excerpt-1-4.pdf detailed presentation on exFAT].		Although Microsoft has published some information on exFAT, there are more technical specifications available from third parties. For example, here is a [http://paradigmsolutions.files.wordpress.com/2009/12/exfat-excerpt-1-4.pdf detailed presentation on exFAT].
		+
	Another published technical paper that goes in the internals in great detail is in the SANS Reading Room at: [http://www.sans.org/reading_room/whitepapers/forensics/rss/reverse_engineering_the_microsoft_exfat_file_system_33274 Reverse Engineering the Microsoft exFAT File System]		Another published technical paper that goes in the internals in great detail is in the SANS Reading Room at: [http://www.sans.org/reading_room/whitepapers/forensics/rss/reverse_engineering_the_microsoft_exfat_file_system_33274 Reverse Engineering the Microsoft exFAT File System]

@@ Line 5: / Line 5: @@
 FAT is described by Microsoft in [[Media:Fatgen103.doc|Microsoft's FAT32 specification]]. Despite the name, the document includes descriptions of FAT12 and FAT16.
-Closely related standards are: ECMA 107 and ISO/EIC 9293, which only cover FAT12 and FAT16.
+Closely related standards are: ECMA 107 and ISO/EIC 9293, which only cover FAT12 and FAT16, and also are somewhat more restricted than the file system described by Microsoft's document.
 == Structure==

@@ Line 88: / Line 88: @@
 === FAT16 ===
 *  It is called FAT16 because all entries are 16 bit.
-*  FAT16 can hold a max of 65,536 addressable units (2 <sub>26</sub>
+*  FAT16 can hold a max of 65,524 addressable units
 *  It is used for small and moderate sized hard disk volumes.
 === FAT32 ===

@@ Line 81: / Line 81: @@
 === FAT12 ===
 *  FAT12 is the oldest type of FAT that uses a 12 bit file allocation table entry.
-*  FAT12 can hold a max of 4,086 clusters (which is 2<sup>12</sup> clusters minus a few values that are reserved for values used in   the FAT).
+*  FAT12 can hold a max of 4,084 clusters (which is 2<sup>12</sup> clusters minus a few values that are reserved for values used in   the FAT).
 *  It is used for floppy disks and hard drive partitions that are smaller than 16 MB.
 *  All 1.44 MB 3.5" floppy disks are formatted using FAT12.

@@ Line 1: / Line 1: @@
 '''FAT''', or File Allocation Table, is a [[File Systems|file system]] that is designed to keep track of allocation status of clusters on a [[hard drive]].  Developed in 1977 by [[Microsoft]] Corporation, FAT was originally intended to be a [[File Systems|file system]] for the Microsoft Disk BASIC interpreter. FAT was quickly incorporated into an early version of Tim Patterson's QDOS, which was a moniker for "Quick and Dirty Operating System". [[Microsoft]] later purchased the rights to QDOS and released it under Microsoft branding as PC-DOS and later, MS-DOS.
 == Structure==
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 *  FAT does not support user quotas
 *  FAT has minimal security features including no access control list (ACL) capability.
-== See also ==
-[[Media:Fatgen103.doc|Microsoft's FAT32 specification]]
 == External links ==
 * http://en.wikipedia.org/wiki/File_Allocation_Table

@@ Line 117: / Line 117: @@
 Although Microsoft has published some information on exFAT, there are more technical specifications available from third parties. For example, here is a  [http://paradigmsolutions.files.wordpress.com/2009/12/exfat-excerpt-1-4.pdf detailed presentation on exFAT].
-Another published technical paper that goes in the internals in great detail is in the SANS Reading Room at: [http://www.sans.org/reading_room/whitepapers/forensics/rss/reverse_engineering_the_microsoft_exfat_file_system_33274]
+Another published technical paper that goes in the internals in great detail is in the SANS Reading Room at: [http://www.sans.org/reading_room/whitepapers/forensics/rss/reverse_engineering_the_microsoft_exfat_file_system_33274 Reverse Engineering the Microsoft exFAT File System]
 === Comparison of FAT Versions ===

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 *  Speeds up storage allocation processes by using free space bitmaps.
 *  Support UTC timestamps (Vista/Server 2008 SP1 does not support UTC, UTC support came out with SP2)
 Although Microsoft has published some information on exFAT, there are more technical specifications available from third parties. For example, here is a  [http://paradigmsolutions.files.wordpress.com/2009/12/exfat-excerpt-1-4.pdf detailed presentation on exFAT].