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Like NTFS, exFAT can pre-allocate disk space for a file by just marking arbitrary space on disk as "allocated". For each file, exFAT uses two separate 64-bit fields in the directory: the valid data length (VDL), which indicates the real size of the file, and the physical data length.
FAT16, FAT32, exFAT, NTFS, ReFS* and CSVFS [9] Windows XP SP3 or higher (x86, x64), Windows 10, Windows Server 2003 SP1, Windows Server 2019 [9] Yes Enterprise Console edition only Yes Yes Yes PerfectDisk 14 Build 900 (2021) [10] UltimateDefrag: DiskTrix Trialware [11] FAT32, NTFS Windows XP and later Yes Yes Yes Yes 6.1.2.0 (28 July 2021 ...
The now obsolete Commodore Amiga Smart File System (SFS) defragmented itself while the filesystem was in use. The defragmentation process is almost completely stateless (apart from the location it is working on), so that it can be stopped and started instantly. During defragmentation data integrity is ensured for both metadata and normal data.
In such a paradigm, no data is ever removed from the disk, so that the operation can be safely stopped even in the event of a power loss. The article picture depicts an example. To defragment a disk, defragmentation software (also known as a "defragmenter") can only move files around within the free space available.
exFAT: No No No Partial (only if the file fits into one contiguous block range) No No No Yes (Linux) FAT12: Partial (only inside of compressed volumes) [61] Partial (only inside of Stacker 3/4 and DriveSpace 3 compressed volumes [30]) No Partial (only inside of compressed volumes) [62] No No No Yes (Linux) FAT16 / FAT16B / FAT16X
The Transaction-Safe Extended FAT File System (TexFAT), TexFAT provides similar functionality to TFAT using the exFAT file system as the base file system instead of FAT. . Introduced with Windows Embedded CE 6.0, it is sometimes referred to as TFAT as well, which can lead to confusion with the original TFAT described a
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NTFS metadata files can also be defragmented. A command-line tool, defrag.exe, has been included, [10] providing access to the defragmenter from cmd.exe and Task Scheduler. In Windows XP, if the Master File Table (MFT) is spread into multiple fragments, defrag.exe and the GUI version can combine the MFT fragments during defragmentation. [11]