Interesting, I had no idea. Am I correct to assume these programs don't recognize partitions and simply write over the entire drive?
Correct, the programs zero wipe the disk and could care less what partitions are on the drive. There are some areas of the disk that the programs do not touch but that is something most people do not need to worry about.
If the drive supports it you can use the SecureErase command. The utility in the article is for ATA drives and I am not sure it will work for SATA. There a version on Parted Magic, $9, but there are risks so I would leave well enough alone and wipe the drive with DBAN.
Edited by JohnC_21, 05 November 2016 - 08:57 AM.