As I mentioned w/ my concerns, I'm going to test all of this out first on my old Inspiron (the wipe and OS reinstall). In fact, I've already started it. However, I forgot to check partitions on that one, though I'm sure it had one of those safety/recover partitions since it was what came from Dell.
I just chose PRNG, and it never gave me any other options about whatever partitions. And it automatically started running the 8-pass PRNG (as opposed to the 4-pass I've read about).
I'll let you know how this test goes, though it may take a while from what I've read.