A PC has sensitive data that must be destroyed, before the PC is redeployed. A technician has been tasked with completely wiping the PC hard drive. Which of the following methods is BEST for the…

A quick format only removes the file system index and marks sectors as available, leaving the actual data intact and easily recoverable with basic recovery software.

FDISK deletes or creates partition information but does not overwrite the underlying data, which remains fully recoverable using partition and data recovery tools.

A low-level format (also called a zero-fill or overwrite) writes data - typically zeros or random patterns - to every addressable sector of the hard drive, overwriting the original data completely. This process renders the previous contents unrecoverable even with advanced forensic tools, making it the appropriate method when a drive containing sensitive information must be securely sanitized before the hardware is redeployed. Standards such as DoD 5220.22-M specify multiple overwrite passes for this purpose.

A standard format removes the file system structure and may scan for bad sectors but does not securely overwrite all data, leaving much of the original content recoverable.