Windows 10: Operating system from SSD deletion.?

Good evening, my hooligans,

Yesterday I finally retired my HDD and got a Crucial MX500 for the operating system and a Crucial P1 NVME for everything else, now I cloned my HDD on the P1 and installed a new Windows on the MX500, how can I delete my old Windows from the P1 now ? Read everywhere only formatting, but then all my data are gone, I just want to delete the system but keep my data because I do not need 2 times Windows and that also I think takes a lot of memory, so how can I delete it ? I am very happy about answers.

With kind regards

TheAllQuestionnaire6

:)

 

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If not a list, then folks can just post their top picks.

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Thank you.