Flash file system / From Wikipedia, the free encyclopedia
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exFAT (Extensible File Allocation Table) is a file system introduced by Microsoft in 2006 and optimized for flash memory such as USB flash drives and SD cards. exFAT was proprietary until 28 August 2019, when Microsoft published its specification. Microsoft owns patents on several elements of its design.
|Full name||Extensible File Allocation Table|
|Introduced||November 2006; 16 years ago (2006-11) with Windows Embedded CE 6.0|
|File allocation||bitmap, linked list|
|Bad blocks||Cluster tagging|
|Max volume size||128 PB, 512 TB recommended[nb 1]|
|Max file size||128 PB[nb 2]|
|Max no. of files||up to 2,796,202 per directory|
|Max filename length||255 characters|
|all Unicode characters except U+0000 (NUL) through U+001F (US) |
(encoding in UTF-16LE)
|Dates recorded||Creation, last modified, last access|
|Date range||1980-01-01 to 2107-12-31|
|Date resolution||10 ms|
|Attributes||Read-only, hidden, system, subdirectory, archive|
|ACL (Windows CE 6 only)|
|Yes, EFS supported in Windows 10 v1607 and Windows Server 2016 or later.|
exFAT can be used where NTFS is not a feasible solution (due to data-structure overhead), but where a greater file-size limit than that of the standard FAT32 file system (i.e. 4 GB) is required.
exFAT has been adopted by the SD Association as the default file system for SDXC cards larger than 32 GB.
Windows 8 and later versions natively support exFAT boot, and support the installation of the system in a special way to run in the exFAT volume.