The procedure described matches the German VSITR (Verschlusssachen-IT-Richtlinien) standard. This standard specifies a seven-pass overwriting method for data sanitization. It involves six passes of alternating binary complements (0x00 and 0xFF) followed by a final seventh pass where the storage media is overwritten with the hexadecimal value 0xAA. Sarah's actions—six alternating overwrites and a final 0xAA pass—are a direct implementation of this specific standard.

A. NAVSO P-5239-26 (MFM) is a three-pass standard, overwriting with a character, its complement, and then a random character.

B. GOST P50739-95 is a Russian standard that typically involves a single pass of zeros or random characters, not seven passes.

D. DoD 5220.22-M is a well-known three-pass standard, which does not match the seven-pass procedure described in the scenario.

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

Table A-2

p. A-4. The table explicitly details the German BSI VSITR standard as a 7-pass method involving alternating 0x00

0xFF

and a final 0xAA pass.

2. Cornell University. (n.d.). Data Wiping Standards. Cornell University IT Security Office. Retrieved from https://it.cornell.edu/security-and-policy/data-wiping-standards (Courseware/policy document referencing and describing various standards including VSITR).