Recognized overwriting standards
Overwriting Standard Overwriting Rounds  
HMG Infosec Standard 5, The Baseline Standard 1 Verification is optional
HMG Infosec Standard 5, The Enhanced Standard 3 Verification is mandatory
Peter Gutmann's algorithm 35  
U.S. Department of Defense Sanitizing (DOD 5220.22-M) 3 Verification is mandatory
Bruce Schneier's Algorithm 7  
Navy Staff Office Publication (NAVSO P-5239-26) for RLL 3 Verification is mandatory
The National Computer Security Center (NCSC-TG-025) 4 Verification is optional
Air Force System Security Instruction 5020 4 Verification is mandatory
U.S. Army AR380-19 3 Verification is mandatory
German Standard BSI/VSITR 7  
OPNAVINST 5239.1A 3 Verification is mandatory
NSA 130-1 3 Verification is mandatory
DoD 5220.22-M ECE 7 Verification is mandatory