Most effective way to clear HD?

I've run into some financial difficulties and need to sell my Mac. However, because I've used it as a company computer, I need to be able to sell it in a condition where there is no possibility of information retrieval. I'm aware there are many ways to "start over" or "erase" the computer, yet still be able to get at those files that were supposedly "erased". I can't have that.
Any ideas? Would I be able to do this on my own? Professional?
Thanks for the help!
Stu

StuGlenLake:
You can do this on your own quite easily.
Formatting, Partitioning Zeroing a Hard Disk Drive
Boot from the install CD holding down the "C" key.
Select language
Go to the Utilities menu (Tiger) Installer menu (Panther & earlier) and launch Disk Utility.
Select your HDD (manufacturer ID) in left side bar.
Select Partition tab in main panel. (You are about to create a single partition volume.)
Select number of partition in pull-down menu above Volume diagram.
(Note: 1 partition is normally better for an internal HDD.)
Type in name in Name field (usually Macintosh HD)
Select Volume Format as Mac OS Extended (Journaled)
Click Partition button at bottom of panel.
Select Erase tab
Select the _sub-volume under Manufacturer ID_ (usually Macintosh HD; selecting the Manufacturer ID will erase the formatting).
Check to be sure your Volume Name and Volume Format are correct.
Select on Security Options button (Tiger) Options button (Panther & earlier).
Select Zero all data. (This process will map out bad blocks on your HDD. However, it could take several hours. Using 7-pass or 35-pass will likely take days depending on the size of your HDD. Zero is secure enough for all practical purposes, but you can choose one of the more secure options.)
Click OK.
Click Erase button
Quit Disk Utility.
If you wish you can re-install the OS at this point and shut down the computer when the setup manager starts up. Then when the new owner starts up he/she can then set up their account. The advantage of installing is that it will further overwrite the disk.
Be sure to include all software when you transfer your computer.
Please do post back should you have further questions or comments.
Good luck.
cornelius
Message was edited by: cornelius

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