Doing a 7 or 35 pass erase with Disk Utility?

Hi,
Awhile ago my hard drive got rewritten over by WindowXP and a month and a half later I found out that residue was left behind with weird looking things in my Core Services folder.
So I want to do a secure erase. Should I do a 7 pass or 35 pass option?
Also when I put my TIger disk in the my DVD slot for the erase am I choosing the main part where it says 149.10 GB ST13086.... or the indented part where it says Macintosh HD?
If I select the main part 149.10 GB ST 130608 it says untitled for the name, do I leave it like that if I choose this option?
S.

sig,
So I can choose Macintosh HD and then security option and then do the 7 pass erase (not worried about the FBI, just want my Windows stuff completely gone)? Do I need to erase the free space first?
Message was edited by: spiralgirl

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