Disk sanitizer

I know this topic has come up before, but I am too lazy to look into the
the archives ;)

I'm aware of:
shred -vz -n 6 /dev/hdx

Also dd:
dd if=/dev/zero of=/dev/hdx bs=4 count=?

I've seen some bootup floppy stuff, and I know most live distros have
the above mentioned tools; however, are these the most efficient
(meaning fastest) methods to cleanse a disk to dod standards? I need
one opensource solution that works for x86 and PPC archs.

TIA

Jared
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