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Disk - Clean and Clean All with Diskpart Command
8. To Use the Clean All Diskpart Command
NOTE: See the green INFO box at the top of the tutorial for more information about this command. This command will wipe the HDD, and perform a secure erase. However, it will take a long time to do. It's best to only use this command if you wanted to help make sure that the data on the HDD cannot be recovered say when giving or selling the HDD to another person.
A) In the elevated command prompt, type clean all and press Enter. You will see the command prompt below as is until the "clean all" command is finished. (see screenshot below)
NOTE: This will take quite some time (several hours or more) to finish depending on how large the disk is since it is writing over each and every sector on it to zero. Think of it as being like a full or low level format.