I'm kind of new to Linux - I'm sending my device back and I want to securely wipe my data partition ONLY! without detroying the o/s partition will:
dd if=/dev/zero of=/dev/md4
do it? Anyone have any better suggestions?
After that, is there an easy way to restore the "factory partitions" (ie. undoing the ssh etc. hacks I've done), or should I just leave it alone?