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Type list disk . Look for the disk number that matches your hard drive's size (usually Disk 0). Select and Wipe: Type select disk X (replace X with your disk number). Type clean all and press Enter.

Before anything else, copy your documents, photos, and saved passwords to an external drive or cloud storage. This process is irreversible.

If you want to ensure your data is completely erased and unrecoverable, you can use a third-party tool like DBAN (Darik's Boot and Nuke) or CCleaner. These tools will overwrite your data with random information, making it impossible to recover.