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

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?

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?