I have a computer with multiple SATA hard disks connected through SATA. The first one has my OS/grub etc and the rest I want to clean and sell.
All the questions I see on the web typically involve using DBAN, but that requires me to boot into the 'dban OS' using a CD/USB. I want to boot into my own Ubuntu installation on /dev/sda1 and then 'use' DBAN, if possible (The reason for this is simple - I want the Ubuntu installation running since it is also sharing files for my family .. so I can't "shut down" the server so to speak)
What are my options? I understand there's always dd, and then there's shred, but from what I have read shred is not that effective on systems with ext3/ext4?