Watch the TV program Mr. Robot!
If using Windows then download c cleaner. Delete all personal files data etc. Basically everything but Windows. Then launch c cleaner and use its drive wiper.
Are you using windows, mac, chrome, linux, a usb hub hooked up to an android phone?
Ccleaner is a free download with an overwrite utility then you need a fresh iso for a new operating system
Right click on the drive letter in file explorer and choose format. You will obviously lose all data.
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