NEW ZEALAND INFORMATION AND COMMUNICATIONS TECHNOLOGY STANDARD NZSIT 402
The New Zealand standard for data erasure (NZSIT 402) is used by many data destruction programs. It serves to overwrite existing information on a hard drive or other storage medium once and constitute, therefore, a software-based method for data erasure. The NZSIT 402 data erasure standard is the New Zealand government standard.
The NZSIT 402 data erasure process is generally implemented in the following manner:
Pass 1: Overwriting the data with a random character as well as verifying the writing of this character
By erasing a hard disk by means of the data erasure method NZSIT 402, the software-based restoration of data is generally prevented. A hardware-based data recovery also fails as a rule. The NZSIT 402 data erasure method was first published by the Communications Security Bureau in the Communications Technology Security Manual by the New Zealand government.