Using pendrive as flash back in win 10

I want win 10(64 bits). I have already win 10(32bits) on my pc.I know I need to do a clean install but I don't have DVD so i will use my pendrive

So I want to know if it would delete my file In the pendrive. If yes, after the installation, can I delete the win 10 iso and put other files in my pendrive

Recent Questions...