Darik's Boot and Nuke

instead of going from one end to the other in order, i want the location to write to be random, maybe even intelligently random(don't write to the same location twice, depends on how often you randomly pick a location)

i understand that this isn't something you would normally want to use, i have a special case with a faulty computer, half way through a pass the blinky stops, so only the first half of the drive gets wiped every single time i run it, i'm sure that hardware is destruction is the ideal solution in this case, but i don't see that as a blocker.