Windows 10: ntuser.dat

  1.    4 Weeks Ago #1


    Why do I have so many ntuser.dat files?
    I counted 20 with various extensions: blf, regtrans-ms, pol, log1, log2, ini
    I'm in windows 10 pro ver.1709 build 16299.248
    thank you
      My ComputerSystem Spec

  2. Posts : 6,392
    10 Home x64 (1709) (10 Pro on 2nd pc)
       4 Weeks Ago #2

    You most likely already know that ntuser.dat is your user profile, loaded at sign in as the HKEY_CURRENT_USER registry hive. You also understand that this is constantly being updated to reflect the changes that happen as you use the PC.

    There transactions are not written to ntuser.dat as they happen, that usually occurs as you sign out or shut down. Instead they are written to the regtrans-ms files (short for registry transactions). Together all these types of files help prevent the registry becoming corrupt, the changes only being committed in a controlled manner at sign out. An 'uncontrolled' shutdown like a BSOD would leave ntuser.dat unmodified, so at next sign in it should be free of any changes that happened in the previous abruptly terminated session.

    Best leave them alone then
      My ComputersSystem Spec

  3.    4 Weeks Ago #3

    I didn't know what is the purpose of ntuser.dat files.
    thank you for clarifying.
    I won't touch them following your advice.
    many many thanks
      My ComputerSystem Spec

  4. Posts : 6,392
    10 Home x64 (1709) (10 Pro on 2nd pc)
       4 Weeks Ago #4

    You're welcome, glad to have helped clarify what's going on.
      My ComputersSystem Spec


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