Erase seagate external for mac-- steps?

hi all,
i want to securely erase a seagate goflex for mac before i sell it and am not sure how to do it so that i am certain all my files are deleted and the new owner get a clean external drive.
i only just started using this drive about a week ago and have only 4 backup files on it. its about 33GB which is a comprehensive backup from my macbook pro with no exclusions.
anyways i just really want to not mess this up and was wondering if someone could show me the steps through disc utility. im a little unsure of what options to check so that i do it the most effective and secure way.
im not overly concerened with a 35 pass... but again just trying to figure out, how one does this so that they can sell the drive without having to worry and that the buyer gets a clean drive without losing the seagate files to run the drive...
thanks!

Could be because nothing has accessed the Seagate since waking the iMac or that the FireWire power stays on and does not cycle when the iMac sleeps and wakes.
I would try two things:
1. Go to the Time Machine Preference and check the box "Show Time Machine in menu bar" then after waking the iMac, select "Back Up Now" from the Time Machine drop down on the menu bar and see if that will wake the Seagate Drive.
2. If not as a test, move the Seagate to a USB port. I'm betting a cold one that it sleep and wake properly connected up to a USB port.
If so, then you should Contact Seagate Support and see what they say about the problem...

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