How to REMOVE windows 10 ?

Aug 16, 2018
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Hi , I'll buy ssd and i already have hdd with windows , i want to install windows into ssd , how to make hdd clean and remove all files from hdd ?
 
Solution
Simplest solution: Disconnect the HDD and mount the SSD. Install windows on SSD.
Connect the HDD, enter bios, set to boot from SSD. Boot windows, delete the Windows folder From the HDD, now presumably D:/ drive.