A company is looking to donate a collection of old PCs that are no longer needed. Which of the following data destruction methods would be MOST secure for highly sensitive information?

A single-pass zero overwrite is considered insufficient for sensitive data because modern recovery tools can sometimes reconstruct data from remnant magnetic signals left after only one pass.

A 3-pass wipe provides more security than a 1-pass wipe but does not meet the higher DoD standard achieved by 7 passes, leaving more potential for data recovery.

A 7-pass random wipe follows the DoD 5220.22-M sanitization standard, which overwrites data multiple times with random bit patterns to prevent magnetic residue from being recovered. Each additional pass makes forensic data recovery exponentially more difficult, making this the most secure option among the software-based choices listed. For highly sensitive information, this level of overwriting significantly reduces the risk of data remnants.

A high-level format only rewrites the file system metadata and directory structure, not the actual data sectors, so data remains recoverable regardless of how many times it is performed.