In addition to recycling and deleting files, Binary Boy can increase privacy by overwriting the original data using the methods below.
Recycle - Send files to the recycle bin. Not secure.
Delete - An ordinary delete. Some utilities can recover these files.
Random Data (1 pass) - The file is overwritten with a single pass of random data and then deleted. This is the fastest of the secure methods.
Random Data (2 passes) - The file is overwritten with two passes of random data and then deleted.
DoD Quick - The first pass overwrites the file with a single repeated byte. A second pass writes the byte's binary complement. The third pass writes random data. The file is then deleted.
DoD Standard - The file is overwritten with a single random byte, then with the byte's binary complement. This is done twice more, and then the file is overwritten with random data and deleted.
NATO - The file is alternately overwritten with all bits on, all off and then is overwritten with random data for 7 total passes.
Gutmann - The file is overwritten 4 times with random data, 27 times with various byte patterns and then 4 more times with random data for a total of 35 passes.