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Because of wear leveling, overwriting software cannot guarantee all blocks are touched. Correct methods:

There are several methods to erase data from a laptop:

Comprehensive Guide to Erasing Data from a Laptop: Methods, Threats, and Forensic Realities

Before selling, recycling, or handing down a laptop, it is crucial to wipe your personal data securely. Simply deleting files or moving them to the Recycle Bin is not enough; that data remains on the hard drive and can be recovered with basic software.

Follow these steps to ensure your data is gone for good.