> When a hard drive is retired, authorized individuals verify that the disk is erased by overwriting the drive with zeros and performing a multi-step verificati

> When a hard drive is retired, authorized individuals verify that the disk is erased by overwriting the drive with zeros and performing a multi-step verification process to ensure the drive contains no data. Thanks. I guess the reason is to avoid future decryption due to either a new crypto attack or to avoid being vulnerable to potential errors in key generation.