Yes it is secure as what happenes is this
First run 000000000000
2nd run 4gv3h904hgw4
4th run 000000000000
3rd run 32r98hg43g[34
and so forth, the reason i brought up encryption is that is one of the main causes people zero out their hard drive.
but beware this method takes a while to run then just running it once, which the NSA has said 32 times is best as most NON government software can't read that far down and they actually have to take the drive to the labs and take them apart to read that far

.
but the commands again (32times in 1 shot if i can recall my bash scripting)
NOTE: DO NOT RUN THIS IT WILL WIPE OUT YOUR HARD DRIVE BEYOND THE POINT OF RECOVERY
CODE
#!/bin/bash
$DRIVE = /dev/sda # change this to your hard drive you wanna erase
$COUNT = 0
while [ $COUNT -lt 16 ] : do
dd if=/dev/zero of=$DRIVE && dd if=/dev/urandom of=$DRIVE
COUNT = $[$COUNT+1]
done
dd count=1 bs=1024 if=/dev/zero of=$DRIVE # erase the first 1megabyte to clear the MBR and partition table
EDIT:
save as blah.sh and and chmod +x it so you can run it, and run it as root and goto sleep and when you wake up it will be cleared.
(i had a guy double check the script for me) it will erase your hard drive 32 times and clear out the MDR and partations of any garbage the last urandom did
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