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Is it better to run ChkDsk /f first, then Sfc /ScanNow or is it better to run the other way around, and does it matter which is run first, as I see no guides online saying which is the best option?

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    If filesystem corruption is suspected, ChkDsk would likely be the first one would want to run first to ensure a corrupted filesystem doesn't create an issue for Sfc and Dism, which must be run before Sfc
    – JW0914
    Jun 22, 2021 at 16:45

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The two commands are very different and for different purposes and, from this perspective, it does not matter which one you run first:

  • CHKDSK is a command to check the file system and files on your disk. It can tell you about the drive health of your disk and filesystem.
  • SFC [System File Checker] is a tool to correct Windows software in your OS by using a secured Windows Storage folder to get corrected versions for system files.

I would only use CHKDSK if I suspected disk errors; my vendor hardware diagnostics tell me my drives are fine, so I do not CHKSDSK.

I run SFC, preceded by DISM, on Windows 10 if I experience strange things or errors, as DISM and SFC have some ability to correct such errors.

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I have a 2yr old 4tb Seagate ext. HD. Over a month ago, something happened to where the drive was non-responsive, yet showing on my pc. I tried a number of suggestion. Nothing worked. When I came across an article about the Scannow process. I did it, the scan took 5minutes and it actually found and fixed some of my issues.

Go the Scannow process, it worked for me. When its done, disconnect hd, reboot and reinsert.

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