Making the data impossible to recover even by applying physical forensics methods is known as of media.

Anti-Forensic Techniques.

Explanation:

Anti-Forensic Techniques are thsoe techniques used to deviate the Forensic tools by injecting fake informations, hiding information, planting bugs, editing or erasing information, rendering it impossible to recover the data. It is a criminal way of hacking approach that restrains Forensics to find the hackers.

Anti-Forensic tools and techniques works in oppose to the Forensic tools and techniques that tries to recover the data, locate the hacker.

Thus the correct answer is anti-forensic techniques.

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