Wiping pass adjustment
The Wiping Pass Adjustment window allows you to define the pattern to be written to disk (hexadecimal value).
This is what the window control elements mean: You may enter any hexadecimal value into the field under the Write pattern switch to write it to a hard disk during any pass (during the first pass in this case).
By setting the switch to Write a random number position, you will first select to write a random value to disk, and specify the length of the random value in bytes in the field below.
The U.S. standard provides the writing of random values to each byte of each disk sector during the first pass, so set the switch to Write a random number position and enter 1 into the field.
Click the OK button to continue.
You will be taken to the algorithm definition window again and will see that the former record (write – 00) was replaced by write – random, 1 byte.
To define the next pass, click the Add button.
You will see the already-familiar window, but this time there will be more switch positions available: two additional positions will be available for selection:
- Write complementary to previous pass pattern: As during the second pass of the U.S. standard, each disk sector is filled with hexadecimal values that are complementary to those written during the previous pass. Therefore you should set the switch to the Write complementary to previous pass pattern position and click the OK button.
You will be taken to the algorithm definition window again. In this window, the second record looks like this: write – complementary to previous step pattern.
Following the U.S. data destruction standard specification, define third and fourth data overwriting passes.
In the same way, you can create any data destruction algorithm to match your security requirements.