NtfsDisableLastAccessUpdate and NtfsDisable8dot3NameCreation: what they change
Short answer
UpdatedNTFS can record when each file was last read and keep a short DOS-style name (PROGRA~1) for every file. Both cost a little work on every file operation. This tweak turns last access updates off and stops new short names from being created. In the registry it sets NtfsDisableLastAccessUpdate to 1 under HKLM\SYSTEM\CurrentControlSet\Control\FileSystem, and 1 more value.
HKLMSYSTEM\
NtfsDisableLastAccessUpdate01
What it does
NTFS can record when each file was last read and keep a short DOS-style name (PROGRA~1) for every file. Both cost a little work on every file operation. This tweak turns last access updates off and stops new short names from being created.
In the app the switch is called "NTFS Lean FS", described there as: Disables LastAccess & 8.3 names to cut FS metadata overhead.
When it helps, and when it hurts
When it helps
- Folders with very many files, where creating and listing files gets slightly faster.
When it hurts
- Very old installers and 16-bit era programs that depend on short names can fail.
- Tools that rely on 'last accessed' dates, including some backup and cleanup tools, lose that information. Existing short names are kept.
What it writes
Exactly what the switch changes, read from the app's source. Switching it off is what the app writes when you turn the tweak off again.
| Key and value | With the tweak | Switching it off |
|---|---|---|
| HKLMSYSTEM\ | 1 | 0 |
| HKLMSYSTEM\ | 1 | 2 |
From the app's source (ntfs_fs_lean.hpp), app 2.0.0, checked .
The same change by hand
You do not need the app for this one. These commands make the changes from the table above. Run them in a Command Prompt opened as administrator, and make a restore point first.
reg add "HKLM\SYSTEM\CurrentControlSet\Control\FileSystem" /v "NtfsDisableLastAccessUpdate" /t REG_DWORD /d 1 /f
reg add "HKLM\SYSTEM\CurrentControlSet\Control\FileSystem" /v "NtfsDisable8dot3NameCreation" /t REG_DWORD /d 1 /freg add "HKLM\SYSTEM\CurrentControlSet\Control\FileSystem" /v "NtfsDisableLastAccessUpdate" /t REG_DWORD /d 0 /f
reg add "HKLM\SYSTEM\CurrentControlSet\Control\FileSystem" /v "NtfsDisable8dot3NameCreation" /t REG_DWORD /d 2 /freg query "HKLM\SYSTEM\CurrentControlSet\Control\FileSystem" /v "NtfsDisableLastAccessUpdate"How to undo it
In the app: Partial
Switching it off turns last-access time updates on for every drive. Windows ships this set to system managed, where Windows decides per drive.
Switch the tweak off in Frozen Tweaks. It writes NtfsDisableLastAccessUpdate back to 0, NtfsDisable8dot3NameCreation back to 2. Switching it off turns last-access time updates on for every drive. Windows ships this set to system managed, where Windows decides per drive.
Changing several settings at once? The app's Make a restore point button, on every plan, makes a Windows restore point before you start.
Verdict
A small, real saving on file-heavy work. Modern Windows already avoids most last access updates on large drives.
Questions
- What does the "NTFS Lean FS" tweak change in Windows?
- In the registry it sets NtfsDisableLastAccessUpdate to 1 under HKLM\SYSTEM\CurrentControlSet\Control\FileSystem, and 1 more value. The full list is in the table on this page, read from the app's source.
- What is the standard value of NtfsDisableLastAccessUpdate?
- Frozen Tweaks writes 0 when you switch the tweak off, which is the value it treats as the Windows standard. With the tweak on, NtfsDisableLastAccessUpdate is 1.
- Is "NTFS Lean FS" safe to switch on?
- A small, real saving on file-heavy work. Modern Windows already avoids most last access updates on large drives. The main cost: Very old installers and 16-bit era programs that depend on short names can fail.
- How do I undo it?
- Switch the tweak off in Frozen Tweaks. Switching it off turns last-access time updates on for every drive. Windows ships this set to system managed, where Windows decides per drive.
- Is "NTFS Lean FS" free in Frozen Tweaks?
- It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.
In the app
- Switch
- NTFS Lean FS
- Category
- Clean
- Plan
- Pro
- Undo
- Partial
Related guides
- Windows 11 Gaming Optimization: What Still Works in 2026An honest audit of Windows 11 gaming tweaks: which settings still measurably help in 2026, which are placebo, and which quietly cost you security.8 min read
- What Is Safe to Delete on a Gaming PC, and What to Leave AloneTemporary files, update leftovers, crash dumps and caches can go. Shader caches cost you stutter once. Here is the list, and what a cleaner should never touch.4 min read
More tweak explainers
- EnablePrefetcher and EnableSuperfetchPrefetch records what a program loads when it starts so the next start is faster, and Superfetch preloads what you use often.2 min read
- Distributed Link Tracking Client (TrkWks)TrkWks keeps shortcuts and links working when the file they point to is moved to another NTFS drive or computer in a domain. What it changes and how to undo it.2 min read
- Scheduled drive optimizationWindows runs a weekly task that defragments hard disks and sends TRIM to SSDs, and Storage Sense has its own cleanup task. What it changes and how to undo it.2 min read
Written by
Frost LIVEFounder of Frozen Tweaks, based in Hamburg, Germany. Publishes settings guides for competitive games on his YouTube channel, Frost LIVE.
In the app
- Category
- Clean
- Plan
- Pro
- Undo
- Partial
Frozen Tweaks
Free for Windows 10 and 11
58 tweaks free, each with an undo switch. Never edits game files.
v2.0.0 · 6.4 MB · Windows 10 and 11, 64-bit · free account, no payment details
Or type frozentweaks.com on your PC.
The free Windows app for competitive games.
58 tweaks free, each with an undo switch. Never edits game files.
v2.0.0 · 6.4 MB · Windows 10 and 11, 64-bit · free account, no payment details
Frozen Tweaks runs on Windows. Send the link to your PC and download it there.
Or type frozentweaks.com on your PC.