Undelete: Bit Patterns used for Secure delete
The standard that Secure delete within Undelete uses is called 5220.22 standard and the secure delete is done by overwriting it with a specific bit pattern specified for this purpose by the National Security Agency (NSA) for the Department of Defense (DOD). Dk Corp are using the DoD three time overwrite standard. There are 3 patterns that are overwritten into the space.
1. Bit pattern #1 = Any Bit Pattern, such as ‘00110101’
2. Bit Pattern #2 = A Bit pattern that is a ones complement of Bit pattern #1. For the above case, it would be ‘11001010’.
3. Bit Pattern #3 = Just a random bit pattern
