Will the HDD be formatted once i reinstall windows 10 on a new SSD via USB?

[bieron lioe]

I currently have my OS installed in the HDD. Last year I added an SSD to my laptop, but refused to move the OS onto it. Fastforward, my laptop performance is quite poor and I decided to reinstall windows onto my SSD. My question is whether or not reinstalling windows 10 onto the SSD will affect the files/data in my current HDD??? will it automatically format both my HDD and SSD OR it will just format the SSD??

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