How to zero out disk apple G3 I do not have the install disk

I have an old IMAC G3 running 10.3.9.  I want to know how to zero out the disk.  I do not have the original installation disk.  Is there a way to erase and zero out all data on the disk, without having the original startup/installation disk?  Thanks.

Actually, it is a G4 with the bulb base.  We are getting rid of this computer, and want to safely and securely erase the hard drive.  I had read that zeroing out the disk is the best way to wipe/scrub this disk.  Thanks!

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