Win 10 reset, clean drive, strange warning?

Oc
4

I just reset my laptop with Clean Drive because I want to sell it. Now comes this warning.

What does that mean for me, should I stop?

De

Press f 9

you can read it here

Oc

The question was, what kind of warning is it, what does it mean

De

This is a note that all data will be deleted from the hard disk for security

only in English

that's nothing bad

Oc

OK thanks