Deleting absolutely everything

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I am selling my 6 months Macbook pro and I would like to delete everything very securely. I would normally do a fresh install and then use disk utility to erase all date on a 35 pass. However I do not have the installation disks. I am not the best at using a mac but could someone tell me everything I have to delete and the steps I must take before I do a 35 pass erase in disk utility?
I have noticed in console that I cant delete 'Diagnostic and usage messages'.
I have gone through Finder then deleted the applications and gone to application support and deleted what I have seen but is there anything I am likely to miss bieng a non techy guy? I don't want to leave anything at all on the mac in the slightest.
 
You would do the 35-pass erase (very hard on the hard drive, if you didn't know) by booting to an installer disk, such as your original disks. How else were you planning to do that?

You need: either the original restore disks, or a commercial OS X installer that will boot your MacBook Pro. Snow Leopard can be purchased for $30
You should always include the operating system disks with any Mac that you may sell.
 
DeltaMac thanks for the reply but I don't have any intstallation disks and I will knock off the price of the new disks in the sale. I am in the middle of a dessert basically and I need to sell it next week so have no time to get a disk.

What I wanted to do was delete everything I could find containing any data from me and then doing a secure 35 pass erase all unused data. What I want to know is because I am not a Techy kind of person what user information/ usage is it easy to over look and not erase before you sell?

As I said before I can not delete 'Diagnostic and usage messages'. Is there anyway I can do this and also what else should I look out for that could contain any king of user information?
 
I have just found that by looking at all the Logs in Console some of them cannot be deleted and if you 'clear display' then when you click on them again they come back. Especially the firewall one as it say which application was listening etc and the access log where it has my name written. How can I delete these please??
 
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That's an incorrect assumption.
There are simple reset scripts that will clear off the user folders, remove description files, and reset the system so it starts up as a brand new system, with a new user setup like a fresh install. Of course, it's not really a substitute for a fresh install.
Don't you know anyone else who has a Mac?

You can even create a new admin user - then log in as that new user, then delete your old user account. That would get you pretty close to removing anything that is yours.
You could even enable the root user, then log in as root user. That will give you ultimate power over your Mac. You can delete folders that will disable your system, as you have authority to do that, even if the system crashes as a result. The system will allow you to do that.
 
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