Should you disable 8dot3 for performance and security?

icrosoft did recommend to disable short names  in a security guide some times back.  There is evidence that file operations in directories (folders) that contain a large number of file can be slowed by short file name creations.  So does it improve performance? The short answer – Yes.

Now should you disable short names?  This answer is going to be on a case by case basis.  Some questions to ask yourself –

  • Do you have older programs that use 8dot3 (short names)?
  • Do you have a folder with a significant amount of files and coping or creating files is slow?

Below is a pic showing the improvement by disabling and stripping

Image:  Blog Technet Microsoft

Here’s what you need to do –

  • Always backup your system
  • Open a Command Prompt as Administrator
  • Type fsutil 8dot3name query c:
    (enter the drive letter at the end)
  • Type fsutil 8dot3name set c: 1
    (This will disable 8.3)
  • If you want to do this system wide, type –
     fsutil behavior set disable8dot3 1
  • To strip existing files with a 8.3 short name, this will scan your computer and the system registry and strip the files of their short names type the following-
    –   fsutil 8dot3name strip /s /v c:


One query 8dot3

disable 8dot3



About TCAT Shelbyville IT Department

The Tennessee College of Applied Technology - is one of 46 institutions in the Tennessee Board of Regents System, the seventh largest system of higher education in the nation. This system comprises six universities, fourteen community colleges, and twenty-six Applied Technology Colleges.
This entry was posted in Technology, Windows, Windows 10, Windows 10 Quick Tips, Windows Server. Bookmark the permalink.

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