How often should I run System File Checker (sfc scannow) ?

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  1. Posts : 88
    Windows 10 Pro 64 bit
       #21

    Does running sfc scannow write to every cell on an SSD?

    I have a relatively newly built PC that I just started using and only has Firefox & Thunderbird on it & sometimes they would lock up the PC. The only way out of this was to power off the PC.

    I ran sfc scannow a few days ago & it said it fixed/replaced files. I looked at the CBS log to the best of my ability & ran the "SR" command and that printout does not show any problem. However everything seems to be working OK now.

    Later I checked Samsung Magician and noticed my 500GB M.2 SSD had 489GB written out of a total 465GB. I don't recall how much was written before I ran sfc scannow, but don't recall anything that high. Either I never paid attention to that parameter or sfc scannow writes to every cell. Using an SSD is new to me & so is Samsung Magician & I'm used to looking at it.

    Does sfc scannow write to every cell?
    Am I better off doing a scan but no repair, then going back & manually replacing any corrupt files?
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  2. Try3's Avatar
    Posts : 9,378
    Windows 10 Home x64 Version 21H2 Build 19044.1288
       #22

    Mike100 said:
    Does running sfc scannow write to every cell on an SSD?
    Mike,

    SFC does not write. It reads.
    - If it finds a faulty 'system' file then it copies it from a built-in backup location back into its rightful place so writing can be involved to that extent.

    You cannot readily replace 'system' files manually. Windows will think you are a piece of malware.
    - The SFC tutorial identifies a 'Dism' procedure that replaces faulty files if SFC has failed to repair them. It does so by getting replacement files using your internet connection.
    SFC-DISM - TenForumsTutorials

    All the best,
    Denis
      My Computer


  3. Posts : 88
    Windows 10 Pro 64 bit
       #23

    I presumed SFC only read, unless it had to replace a file.

    I just really started using the PC after I installed Thunderbird which was 8 days ago. Then I saw how much has been written to the SSD. How could Firefox (10 days old) and Thunderbird create a disk full of writes in less than 2 weeks, especially since the Thunderbird profiles & email are on the D: drive.

    I did some searching & came across this where it says "Logs are another problem because data is being constantly written to the SSD's cells." That concerned me because a CBS log was generated.

    https://www.nvidia.com/en-us/geforce...and-how-to-pr/

    Rhetorical question I guess, but how the heck could I have written 489GB?

    EDIT - I just looked & now have 504GB written. What the heck is going on?
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  4. Try3's Avatar
    Posts : 9,378
    Windows 10 Home x64 Version 21H2 Build 19044.1288
       #24

    I cannot answer your question.
    - I disagree with the suggestion that Windows' logs are a problem for SSDs.
    - That SSD is still more likely than not to outlive your computer.

    I would expect others to join in this discussion during Wednesday so I hope one of them is able to explain your disk usage.

    All the best,
    Denis
      My Computer


 
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