Ideally I would like to wipe free space across all drives, so when I delete all data and shares and run this, the empty space gets overwritten or even better I already use sort of a 'shred' function to delete all data in the first place and wipe empty space afterwards. This is an older topic and I just stumbled over it looking for some options to wipe most of the drives of my NAS. Personally, I think a single run with /dev/zero would be enough before sending back a disk for warranty replacement. More times and they would most likely need some serious equipment to find any useful data from the disk. One run with /dev/urandom is probably enough to stop a casual analysis.
If you have to do it on the NAS then there is always /bin/dd.
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