Which method involves writing multiple patterns across all storage media?

Overwriting is a data sanitization technique that involves writing new data, such as patterns of ones, zeros, or random characters, onto a storage medium to obliterate the data that was previously there. Secure overwriting standards often mandate multiple passes or "writing multiple patterns" to ensure the original data is forensically unrecoverable. This process is also referred to as wiping or shredding (in a digital context). The method described in the question directly corresponds to the definition of overwriting.

A. Purging: This is a category of sanitization that renders data unrecoverable even with advanced laboratory techniques; overwriting is one method to achieve a purge.

B. Deleting: This standard operation only removes the file's pointer or entry in the file system's index, leaving the actual data intact on the media until overwritten.

C. Destroying: This is a physical process, such as shredding, melting, or incineration, that renders the storage media completely unusable. It does not involve writing patterns.

1. National Institute of Standards and Technology (NIST). (2014). Special Publication 800-88 Revision 1: Guidelines for Media Sanitization.

Section 2.5

"Sanitization Methods

" Page 8: Defines Overwrite: "Overwrite is a sanitization method that may be used for some media types. Overwriting uses a dedicated tool to write a pattern of data (e.g.

all zeros) onto the media... For ATA hard disk drives manufactured after 2001... a single overwrite pass is sufficient to Clear the media. For older drives

multiple passes may be required." This confirms overwriting involves writing patterns

sometimes in multiple passes.

Appendix A

"Minimum Sanitization Recommendations

" Table A-1

Page 20: Lists "Overwrite" as a specific technique for achieving the "Clear" and "Purge" sanitization levels for various media types like Magnetic Disks and Flash Based Storage.

2. Solms

S. V.

& Vuuren

J. V. (2005). Information Security Governance. Springer Science & Business Media.

Chapter 6

Section 6.4.2

"Sanitisation

" Page 118: "Overwriting is a process whereby a random pattern of meaningless data is written to every sector of a device... To be sure that all data is erased

the overwriting process should be repeated a number of times with different data patterns." This academic source explicitly links "overwriting" with writing multiple

different data patterns.