ExFAT
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.[5] exFAT was proprietary until 28 August 2019, when Microsoft published its specification.[6] Microsoft owns patents on several elements of its design.[2]
| Developer(s) | Microsoft |
|---|---|
| Full name | Extensible File Allocation Table |
| Introduced | November 2006; 16 years ago (2006-11) with Windows Embedded CE 6.0 |
| Partition IDs | |
| Structures | |
| Directory contents | Table |
| File allocation | bitmap, linked list |
| Bad blocks | Cluster tagging |
| Limits | |
| Max volume size | 128 PB, 512 TB recommended[1][nb 1] |
| Max file size | 128 PB[nb 2] |
| Max no. of files | up to 2,796,202 per directory[2] |
| Max filename length | 255 characters |
| Allowed filename characters | all Unicode characters except U+0000 (NUL) through U+001F (US) / (slash) \ (backslash) : (colon) * (asterisk) ? (question mark) " (quote) < (less than) > (greater than) and | (pipe)(encoding in UTF-16LE)[citation needed] |
| Features | |
| Dates recorded | Creation, last modified, last access |
| Date range | 1980-01-01 to 2107-12-31 |
| Date resolution | 10 ms |
| Forks | No |
| Attributes | Read-only, hidden, system, subdirectory, archive |
| File system permissions | ACL (Windows CE 6 only) |
| Transparent compression | No |
| Transparent encryption | Yes, EFS supported in Windows 10 v1607 and Windows Server 2016 or later. |
| Other | |
| Supported operating systems |
|
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.[7]