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L2L:{0|1} |
L2R:{1|0} |
R2L:{1|0} |
R2R:{1|0} |
Remarks |
The MFT Zone is a reserved area that enables the master file table (MFT) to expand as needed to prevent MFT fragmentation. If the average file size on the volume is 2 KB or less, it can be beneficial to set the mftzone value to 2. If the average file size on the volume is 1 KB or less, it can be beneficial to set the mftzone value to 4. |
When disable8dot3 is set to 0, every time you create a file with a long file name, NTFS creates a second file entry that has an 8.3 character-length file name. When NTFS creates files in a directory, it must look up the 8.3 character-length file names that are associated with the long file names. This parameter updates the HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\NtfsDisable8dot3NameCreation registry key. |
The allowextchar parameter updates the HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\NtfsAllowExtendedCharacterIn8dot3Name registry key. |
The disablelastaccess parameter reduces the impact of logging updates to the Last Access Time stamp on files and directories. Disabling the Last Access Time feature improves the speed of file and directory access. This parameter updates the HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\NtfsDisableLastAccessUpdate registry key. |
Notes: |
File-based Last Access Time queries are accurate even if all on-disk values aren't current. NTFS returns the correct value on queries because the accurate value is stored in memory. |
One hour is the maximum amount of time that NTFS can defer updating Last Access Time on disk. If NTFS updates other file attributes such as Last Modify Time, and a Last Access Time update is pending, NTFS updates Last Access Time with the other updates without additional performance impact. |
The disablelastaccess parameter can affect programs such as Backup and Remote Storage, which rely on this feature. |
Increasing the physical memory doesn't always increase the amount of paged pool memory available to NTFS. Setting memoryusage to 2 raises the limit of paged pool memory. This might improve performance if your system is opening and closing many files in the same file set and is not already using large amounts of system memory for other apps or for cache memory. If your computer is already using large amounts of system memory for other apps or for cache memory, increasing the limit of NTFS paged and non-paged pool memory reduces the available pool memory for other processes. This might reduce overall system performance. This parameter updates the HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\NtfsMemoryUsage registry key. |
The value specified in the mftzone parameter is an approximation of the initial size of the MFT plus the MFT Zone on a new volume, and it is set at mount time for each file system. As space on the volume is used, NTFS adjusts the space reserved for future MFT growth. If the MFT Zone is already large, the full MFT Zone size is not reserved again. Because the MFT Zone is based on the contiguous range past the end of the MFT, it shrinks as the space is used. |
The file system doesn't determine the new MFT Zone location until the current MFT Zone is completely used. Note that this never occurs on a typical system. |
Some devices may experience performance degradation when the delete notification feature is turned on. In this case, use the disabledeletenotify option to turn off the notification feature. |
Examples |
To query for the disable 8dot3 name behavior for a disk volume specified with the GUID, {928842df-5a01-11de-a85c-806e6f6e6963}, type: |
fsutil behavior query disable8dot3 volume{928842df-5a01-11de-a85c-806e6f6e6963} |
You can also query the 8dot3 name behavior by using the 8dot3name subcommand. |
To query the system to see if TRIM is enabled or not, type: |
fsutil behavior query DisableDeleteNotify |
This yields an output similar to this: |
NTFS DisableDeleteNotify = 1 |
ReFS DisableDeleteNotify is not currently set |
To override the default behavior for TRIM (disabledeletenotify) for ReFS v2, type: |
fsutil behavior set disabledeletenotify ReFS 0 |
To override the default behavior for TRIM (disabledeletenotify) for NTFS and ReFS v1, type: |
fsutil behavior set disabledeletenotify 1 |
fsutil dirty |
Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows 10, Windows Server 2012 R2, Windows 8.1, Windows Server 2012, Windows 8 |
Queries or sets a volume's dirty bit. When a volume's dirty bit is set, autochk automatically checks the volume for errors the next time the computer is restarted. |
Syntax |
fsutil dirty {query | set} <volumepath> |
Parameters |
Parameter |
Description |
query |
Queries the specified volume's dirty bit. |
set |
Sets the specified volume's dirty bit. |
<volumepath> |
Specifies the drive name followed by a colon or GUID in the following format: volume{GUID}. |
<volumepath> |
volume{GUID} |
Remarks |
A volume's dirty bit indicates that the file system may be in an inconsistent state. The dirty bit can be set because: |
The volume is online and it has outstanding changes. |
Changes were made to the volume and the computer was shut down before the changes were committed to the disk. |
Corruption was detected on the volume. |
If the dirty bit is set when the computer restarts, chkdsk runs to verify the file system integrity and to attempt to fix any issues with the volume. |
Examples |
To query the dirty bit on drive C, type: |
fsutil dirty query c: |
If the volume is dirty, the following output displays: Volume C: is dirty |
Volume C: is dirty |
If the volume isn't dirty, the following output displays: Volume C: is not dirty |
Volume C: is not dirty |
To set the dirty bit on drive C, type: |
fsutil dirty set C: |
fsutil file |
Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows 10, Windows Server 2012 R2, Windows 8.1, Windows Server 2012, Windows 8 |
Finds a file by user name (if Disk Quotas are enabled), queries allocated ranges for a file, sets a file's short name, sets a file's valid data length, sets zero data for a file, or creates a new file. |
Syntax |
fsutil file [createnew] <filename> <length> |
fsutil file [findbysid] <username> <directory> |
fsutil file [optimizemetadata] [/A] <filename> |
fsutil file [queryallocranges] offset=<offset> length=<length> <filename> |
fsutil file [queryextents] [/R] <filename> [<startingvcn> [<numvcns>]] |
fsutil file [queryfileid] <filename> |
fsutil file [queryfilenamebyid] <volume> <fileid> |
fsutil file [queryoptimizemetadata] <filename> |
fsutil file [queryvaliddata] [/R] [/D] <filename> |
fsutil file [seteof] <filename> <length> |
fsutil file [setshortname] <filename> <shortname> |
fsutil file [setvaliddata] <filename> <datalength> |
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