Which type of data purging standard requires seven full passes or rewrites with bit-level erasure software?

DoD 5220.22-M is the type of data purging standard that requires seven full passes or rewrites with bit-level erasure software.

The “DoD standard,” referring to DoD 5220.22-M, is a term often used in the data sanitization industry. This standard specifies a process overwriting hard drives with patterns of ones and zeros and requires three secure overwriting passes and verification at the end of the final pass.

i've had the same problem. i generally just ignore it, as a ton of these "verified answers" are completely wrong.